Most smart thermostats are sold on app polish and a learning algorithm. Neither matters much on a heat pump. What matters is whether the thermostat will hold the electric backup heat off until the compressor genuinely cannot keep the house warm, and whether it can stage your system correctly. Get that wrong and a single cold snap can undo every dollar a smart thermostat was supposed to save you.
We spent weeks reading wiring diagrams, install guides and owner reviews across 12 models, then sorted them against the four heat pump configurations that actually show up in homes: simple single-stage, dual-fuel with a backup furnace, three-stage, and ductless mini-split. The Sensi ST55 came out on top for most people. It handles heat pumps, rarely needs a C-wire, and gives you manual control over when auxiliary heat joins in. Two other picks matter if you want a touchscreen or you live in a Google Home house.
This guide also covers the parts of the topic that roundups usually skip: what auxiliary heat lockout actually does, why a deep overnight setback costs you more than it saves on a heat pump, which systems will refuse a third-party thermostat entirely, and what to set the moment you finish installing. Updated for 2026.
Top 3 Picks for Heat Pumps (2026)
Sensi ST55
- Heat pump ready
- No C-wire in most installs
- Alexa and HomeKit support
- 3 year warranty
Honeywell Home T9
- Color touchscreen
- Heat pumps with electric backup
- C-wire required
- Alexa and Google Assistant
Amazon Smart Thermostat
- Alexa native control
- C-wire required
- Home away and sleep schedules
- Comfort zones
Quick Overview: All 12 Smart Thermostats for Heat Pumps in 2026
Every model below runs most heat pumps. The differences that matter to a heat pump owner are staging support, how the unit handles the C-wire, and whether it gives you a real auxiliary heat lockout setting rather than a fixed default.
| Product | Specifications | Action |
|---|---|---|
| Sensi ST55 |
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Check Latest Price |
 Google Nest Thermostat |
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| Amazon Smart Thermostat |
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| Honeywell Home T9 |
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 ecobee Smart Thermostat Premium |
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 ecobee Smart Thermostat Enhanced |
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 Honeywell Lyric T6 Pro |
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 Sensi Lite ST25 |
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 ecobee Smart Thermostat Essential |
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 Honeywell Home T5 |
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 Honeywell Vision Pro 8000 |
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 Sensi Touch 2 |
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Why Auxiliary Heat Lockout Matters More Than Any App Feature
A heat pump does not burn fuel to make heat. It moves it, and the compressor delivers roughly two to three times as much heat per unit of electricity as the electric resistance strips behind it. The NEEP cold-climate specification puts the compressor coefficient of performance, or COP, at about 3.40 at 47F and about 2.25 at 17F. Strip heat always scores 1.0 because that is all electric resistance can do.
That gap is why a strip heat hour costs you roughly two to three times what a compressor hour costs at the same outdoor temperature. The thermostat decides when the strips join in, and most units ship with a lockout default that is far too eager. On a cold morning the compressor calls for backup heat at 35F or above even though it could have kept going a while longer.
The fix is the auxiliary heat lockout setting. Raise it, tune it to your system balance point, and the compressor works harder before it reaches for resistance heat. A range somewhere in the low to upper 30s is a common starting point, then adjust from your own runtime data. Setbacks matter just as much. A deep overnight drop of 8 to 10 degrees sounds efficient but forces expensive recovery in the morning, so keep heat pump setbacks shallow at around 2 to 4 degrees.
One more honesty check on savings. Manufacturer pages advertise numbers like up to 23 or 26 percent for ecobee and up to 20 percent for Nest. Those figures come from vendor-funded studies with specific assumptions. Independently measured heating savings from scheduling land closer to 10 to 12 percent. Most of the real gain comes from setbacks you would not have set by hand, not from the brand name on the box.
1. Sensi ST55: The Best Smart Thermostat for Heat Pumps Overall
Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55
Wi-Fi
Heat pump ready
No C-wire in most installs
ENERGY STAR
3 year warranty
Pros
- Quick DIY install often reported at 10-15 minutes
- Usually no C-wire needed on many systems
- Day-by-day schedules are easy to duplicate
- Built-in level on the back plate
- Shows humidity on the unit and in the app
Cons
- High and low alert thresholds are fixed in the app
- Some owners hit initial Wi-Fi registration failures
- Small display by newer color screen standards
- Companion app UI could use a refresh
The ST55 is the model we keep coming back to because it does the boring part of heat pump control correctly and gets out of the way. Its spec sheet lists heat pump among its supported uses, and the app exposes stage and backup heat settings rather than hiding them behind a generic furnace profile. With over 23k reviews averaging 4.4, it is also the most proven option on this list by a wide margin.
Installation is the part people underestimate. A built-in level on the back plate and step-by-step app instructions get most owners through it in about 10 to 15 minutes. If your system has no common wire, the ST55 usually does not need one, which removes the single biggest reason people put off upgrading.
The schedule editor is where it quietly wins. Schedules are laid out day by day and easy to copy forward, so you can build a weekday plan and a weekend plan without re-entering temperatures. Owners also like that the humidity reading appears on the device itself, not only in the app.
Usage reports, equipment alerts and filter change reminders are all included without a subscription. That matters on a heat pump because a clogged filter shows up as a comfort problem long before it shows up as a failure.
Who the Sensi ST55 fits
This is the pick for a single-stage or two-stage ducted heat pump with a conventional 24V system, especially if your wiring has no common wire. It also suits anyone who wants a straightforward schedule without paying for sensors or a voice assistant they will never use.
If your system is three-stage or if you have a very large home with uneven temperatures, the ST55 will run the equipment but it will not fix the room balance problem. That is a sensor job, and the sensor picks further down handle it better.
Where the ST55 falls short
The alert thresholds are the most common complaint, and they are a real limitation. High and low temperature and humidity alerts use fixed values you cannot change in the app, which limits how useful the alerts are in a house with big temperature swings.
A noticeable share of owners report Wi-Fi registration problems right after installation, where the panel locks up for a period before connecting. Some also point to a small monochrome screen and an app interface that has not been redesigned in a while. If you want a color display, look further down the list.
2. Google Nest Thermostat: Best Fit for Google Home Households
Google Nest Thermostat – Smart Thermostat for Home – Programmable Wifi Thermostat – Charcoal
Wi-Fi and BLE
Geofencing auto-away
2 inch LCD
1 year warranty
Pros
- Largest review base on this list
- Geofencing and occupancy based Eco mode
- Learning behavior adapts within about a week
- Shows time until target temperature
- Works with Google Assistant and Matter assistants
Cons
- Needs a C wire or power adapter on many heat pump and zoned systems
- Thin printed documentation in the box
- No live chat or phone support
- Swipe ring interface frustrates less technical users
- One year warranty is the shortest here
With nearly 30k reviews, the Nest is the most widely used smart thermostat in homes, and its strengths are real: the circular design disappears into a wall, and the Google Home app schedules quickly once you learn it. Auto-away through phone geofencing plus Eco mode based on occupancy is genuinely hands-off.
For heat pumps, the product page is unusually direct about the limitation. It works without a C wire in most homes, but a C wire or power accessory is needed for heating-only, cooling-only, zone controlled and heat pump systems. On a heat pump install, treat the C wire as required until you have confirmed otherwise.
That single line is the deciding factor for most people reading this. A heat pump with auxiliary heat needs a thermostat that can hold backup heat off deliberately, and several owners report moving away from Nest after trouble controlling auxiliary heat on heat pump systems.
The learning behavior settles in after about a week and then works without attention. Savings Finder suggests schedule tweaks, and HVAC monitoring alerts you when something looks wrong with the system.
Who the Nest fits
This is the choice for a household already running Google Home, especially one with an existing Nest temperature sensor or a Nest camera setup. The learning schedule works well when your week has a predictable rhythm.
It is also reasonable on a rental or second property where you mostly want remote control and away settings rather than fine auxiliary heat management.
Where the Nest falls short
The rating on this one is the lowest of the twelve at 4.1, with a meaningful share of one-star reviews, and the reasons cluster in two places: power requirements and connectivity. Persistent E294 errors and units dropping offline in the app are reported often enough to plan for.
Documentation is thin, support is limited to online channels, and the swipe-ring control is awkward for older users or anyone who prefers physical buttons. The one-year warranty is also the shortest in this group.
3. Amazon Smart Thermostat: The Most Versatile for Alexa Homes
Amazon Smart Thermostat, Save money and energy, Works with Alexa and Ring, C-wire required
Alexa native
C-wire required
Monochrome display
Honeywell Home hardware
Pros
- Voice and app control through Alexa out of the box
- Comfort zones adjust by temperature or presence
- Built on Honeywell Home thermostat hardware
- App guided DIY installation
- ENERGY STAR certified
Cons
- C-wire required so it will not work on two-wire systems
- Limited integrations compared with ecobee or Nest
- Basic monochrome screen with little detail
- Lowest average rating in this group at 4.0
The appeal here is straightforward. If your household already runs on Alexa, this thermostat connects to it directly, and Comfort Zones can nudge the set point based on nearby Alexa device readings or presence detection. Home, away and sleep schedules cover the basics without a learning model to train.
Under the plastic, this is Honeywell Home thermostat technology, which tells you something about the HVAC side. Long-time users on r/homeautomation commonly describe Honeywell hardware as dependable, and the same engineering shows up here even though the software layer is Amazon’s.
App-guided installation walks you through wiring, and customer service is available through the Alexa app if you get stuck. On a heat pump it will run the compressor and the backup stage, but the controls are simpler than what the ecobee and Honeywell models expose.
Owners running schedules heavily report seeing savings on their bills, and the rebate finder surfaces local utility programs after purchase, which can offset some of the cost.
Who the Amazon Smart Thermostat fits
It suits an Alexa-first household that wants scheduling and voice control without spending much more than a basic programmable model. It is a sensible first smart thermostat when the wiring already includes a common wire.
It is also a good fit for anyone who does not want to manage a subscription or a complex app, since the feature set is deliberately narrow.
Where it falls short
The C-wire requirement is the dealbreaker for some homes. Any system running on two wires is out, and that is a fair number of older installations.
The monochrome screen shows little detail, integrations outside the Alexa ecosystem are limited, and the 4.0 average rating comes with a 14 percent share of one-star reviews. If you want room sensors or granular auxiliary heat control, this is not the unit.
4. Honeywell Home T9: The Most Compact for Heat Pumps With Electric Backup
Honeywell Home RTH9600WF Smart Color Thermostat ENERGY STAR Wi-Fi Programmable Touchscreen Alexa Ready – C-Wire Required
Color touchscreen
Heat pumps with electric backup
C-wire required
2 year warranty
Pros
- Listed compatibility with heat pumps that have electric backup heat
- Customizable color display shows humidity and forecast
- Works with Alexa and Google Assistant
- IFTTT support for deeper automation
- Scheduling plus full remote app control
Cons
- C wire required on most installs
- Not compatible with 120-240V electric baseboard heat
- Deep wall plate compared with slimmer rivals
- No occupancy sensor so scheduling is entirely manual
The T9 is the one we recommend when the system has electric backup heat and the homeowner wants to see everything at a glance. The listing explicitly names heat pumps with electric backup heat as supported, and the color screen shows indoor and outdoor temperature, humidity and a daily forecast on the home screen.
That display detail is more useful than it sounds on a heat pump. When aux heat fires unexpectedly, being able to see the outdoor temperature right on the thermostat tells you whether the lockout setting is actually doing its job.
Integration is broad. Alexa, Google Assistant, Microsoft Cortana and IFTTT are all supported, and a rebate finder checks eligibility for local utility incentives. The box includes wire labels and a quick start guide, which is more than some rivals provide.
Scheduling is flexible and the app handles remote access cleanly. For a dual-fuel system where you want to compare heat pump runtime against furnace runtime, that reporting is where the value shows up.
Who the T9 fits
It is the pick for a ducted heat pump with electric strip backup, particularly in a home where someone other than you will operate the thermostat. Big readable numbers and simple touch controls age better than a menu-driven device.
It also works well for anyone who wants voice control through whichever assistant they already use rather than committing to one ecosystem.
Where the T9 falls short
There is no occupancy sensor, so every schedule is manual. If you want the thermostat to learn when the house is empty, this is not it. The wall plate is also deeper than most competitors, which can matter on an older wall.
You will need a C wire, and the unit does not support 120-240V electric baseboard heat. The warranty is two years rather than the three years offered by Sensi and ecobee.
5. ecobee Smart Thermostat Premium: Best Multi-Room Comfort
ecobee Smart Thermostat Premium – WiFi, Siri & Alexa Built-In, Smart Sensor
SmartSensor included
Radar occupancy sensing
Air quality monitor
Power Extender Kit
Pros
- Included SmartSensor balances hot and cold rooms
- Radar sensor preheats and precools before you arrive
- Built-in air quality monitor with filter alerts
- Works with 95 percent of HVAC systems including heat pumps
- Power Extender Kit included in the box
- Three year warranty
Cons
- Siri requires an Apple home hub
- Two-way talk and smoke alarm listening need a security subscription
- Extra SmartSensors are sold separately
- Remote features depend on an internet connection
The Premium is the only unit on this list that ships with a room sensor in the box, and on a heat pump that sensor often matters more than any other feature. Heat pumps deliver air at a lower temperature over a longer period, which is exactly the delivery pattern that produces uneven room temperatures in a two-story house.
The radar occupancy sensor adds preheat and precool, so the system starts working before you arrive rather than after you feel cold. A built-in air quality monitor tracks particulates and reminds you about filter changes, which supports the airflow side of heat pump performance.
Compatibility is the strongest claim here, with the manufacturer verifying 95 percent of HVAC systems including heat pumps, and the box includes a Power Extender Kit so most homes do not need a C wire. The build is metal rather than plastic and the warranty runs three years.
There is a built-in speaker with Siri or Alexa, plus two-way talk from the thermostat when paired with an ecobee doorbell camera. You can see the system live from the wall unit, which some households find genuinely useful.
Who the ecobee Premium fits
It fits large homes with uneven heating, families with a hallway thermostat in a bad location, and anyone willing to add a few SmartSensors to bedrooms and upstairs. Apple HomeKit users get the deepest integration of any pick here.
It is also the pick for people who have been burned by strip heat firing overnight and want manual control over the auxiliary heat lockout. Homeowners posting on r/ecobee consistently report that hand-setting the lockout is what keeps strip heat off during cold snaps.
Where the Premium falls short
It is the most expensive unit we tested, and several genuinely useful features sit behind a subscription. Two-way talk and smoke alarm listening require ecobee Smart Security, and additional sensors are sold one at a time.
Siri needs an Apple home hub, and the remote features depend on an internet connection and account. Home Assistant users rate ecobee’s local API as the most reliable local integration path, which is another reason this model keeps working when cloud services do not.
6. ecobee Smart Thermostat Enhanced: Top Rated With Occupancy Sensing
ecobee Smart Thermostat Enhanced, Programmable Wifi Thermostat
Occupancy sensing
Heat pump 2H/1C
PEK included
3 year warranty
Pros
- Highest average rating in this group at 4.4
- Built-in occupancy sensing schedules comfort automatically
- Power Extender Kit included so most installs need no C wire
- eco+ uses local weather and grid activity
- Metal construction with a three year warranty
Cons
- No SmartSensor included which is the flagship feature
- No built-in speaker or air quality sensor
- Second-highest price in this group
- SmartSensors must be bought separately
The Enhanced is the same ecobee software experience without the speaker, the camera features and the air quality sensor. What it keeps is the part that matters on a heat pump: occupancy sensing, a Power Extender Kit in the box, and verified compatibility with heat pumps across 90 percent of systems.
Occupancy sensing means the thermostat learns when the house is empty and pre-cools or pre-heats ahead of your return rather than waiting. The eco+ feature factors in local weather and grid activity, and on systems with time-of-use pricing that can shift recovery away from peak hours.
App control works from a phone, tablet or Apple Watch, and it works with Apple HomeKit, Alexa, Google Assistant and SmartThings. Construction is metal with a three year warranty, so the durability story is better than most plastic-bodied rivals.
At 4.4 across more than 3700 reviews, it holds the highest average rating in this group alongside the Sensi ST55. If you want the ecobee app and the sensing logic but not the smart speaker, this is the efficient way in.
Who the Enhanced fits
It suits a two-stage heat pump household that wants automatic occupancy handling and full smart home flexibility without paying for hardware features it will never use. It is a strong choice for Apple HomeKit homes that do not run an Apple home hub.
It also works for anyone upgrading from a basic thermostat who expects to add a SmartSensor later for one bedroom, since the model supports room-level control.
Where the Enhanced falls short
The missing SmartSensor is the honest limitation. Room-by-room balancing is the flagship feature of the line and you pay extra for it here, so budget for a sensor if that is your goal.
There is no built-in speaker, voice assistant or air quality monitor, and the price still sits near the top of this list. Choose the Essential instead if you do not need occupancy sensing.
7. Honeywell Lyric T6 Pro: Best for Two-Stage Heat Pumps
Honeywell TH6220WF2006/U Lyric T6 Pro Wi-Fi Programmable Thermostat with Stages Up to 2 Heat/1 Cool Heat Pump or 2 Heat/2 Cool Conventional
2 heat 1 cool staging
2 heat 2 cool conventional
7 day programming
Wi-Fi
Pros
- Two-stage heat pump staging handled natively
- Proven Lyric platform familiar to HVAC contractors
- Compact non-touch display is easy to read
- Flexible programming with a set-and-forget mode
Cons
- No touchscreen or color display
- C wire typically needed for full Wi-Fi function
- Older 2016 platform without occupancy sensing
- Limited spec detail in the current listing
Staging is where this one earns its place. The T6 Pro is specified for up to two heat and one cool on heat pump systems, and up to two heat and two cool on conventional systems, which covers the majority of two-stage residential heat pumps sold in the last decade.
It is also the model most HVAC technicians already know. That matters more than it sounds, because a familiar platform means faster installs and fewer configuration surprises when something needs troubleshooting.
The tradeoff is that there is no touchscreen and no color screen. You get a compact, legible non-touch display with 7-day flexible programming, plus a set-and-forget mode if you would rather not build a schedule at all.
App-based remote control handles the scheduling and lets you check on the system from a phone. Two AA batteries provide backup power.
Who the T6 Pro fits
It fits a two-stage heat pump owner who values correct staging and dependable hardware over interface polish. It is a sensible choice for a second home, a rental, or any installation where a contractor will be doing the work.
It is also the more realistic option when the heat pump is being replaced at the same time, since the staging profile matches what installers order most often.
Where the T6 Pro falls short
A C wire is typically required for full Wi-Fi functionality, so this is not the answer for a two-wire system. The design is also from 2016, which means no occupancy sensing, no air quality monitoring and no modern app features.
Reviewers who want room-level control or a color display should look elsewhere. The listing itself carries limited specification detail, so confirm the staging configuration with your system data plate before ordering.
8. Sensi Lite ST25: The Simple First Smart Thermostat
Sensi Lite Smart Thermostat, WiFi, Alexa, DIY, Energy Star Certified, ST25
Battery or C wire
Built-in level
Heat pump ready
3 year warranty
Pros
- App-guided install finished in about 10-15 minutes
- Large readable numbers on a simple touchscreen
- Temperature accuracy within about half a degree
- Geofencing and 7-day scheduling in a straightforward app
- Three year warranty
Cons
- C wire required for heat pump systems
- Wi-Fi dropouts reported by a noticeable share of owners
- Monochrome display with no color options
- Some units drain batteries faster than expected
The Lite is the least complicated unit here that still speaks heat pump. Its spec sheet names heat pumps among supported systems, and the app exposes the settings a heat pump owner needs without burying them in layers.
Installers praise the built-in level on the back plate and the step-by-step guidance in the app. Several owners report completing the install in about 10 to 15 minutes and hitting accuracy within roughly half a degree of a service thermometer.
One review pattern worth repeating: owners report it working on systems where other smart thermostats refused to connect. That makes it a useful fallback when a more expensive unit turns out to be incompatible with your wiring.
Alexa and Google Assistant support, geofencing and 7-day scheduling cover the mainstream needs, and Sensi states it does not sell personal information or use thermostat data for advertising.
Who the Sensi Lite fits
It fits a first smart thermostat install on a simple ducted heat pump where the wiring already supports it, and for anyone who wants scheduling without learning a complex app.
It is also a sensible fallback purchase for an older system, since it has proven able to work where feature-rich models could not be installed.
Where the Lite falls short
On heat pumps a C wire is required, so it does not solve the no-common-wire problem that the full-size Sensi ST55 handles. That is the single most important distinction between the two.
Wi-Fi dropouts are the dominant complaint and contribute to a 16 percent share of one-star reviews. The screen is monochrome, and some owners report faster battery drain and weak battery spring contacts. Two AA batteries are included.
9. ecobee Smart Thermostat Essential: Best Value Inside the ecobee App
ecobee Smart Thermostat Essential – WiFi Thermostat, Energy Star Certified
Color touchscreen
Heat pump 2H/1C
eco+ scheduling
Free upgrades
Pros
- Color touchscreen at a lower price point than other ecobee models
- Works with 2H/1C heat pump systems
- Free software upgrades extend device longevity
- Supports HomeKit and Google Assistant
- A color screen is unusual at this price
Cons
- Power Extender Kit and trim kit sold separately
- SmartSensors sold separately
- No built-in speaker or air quality monitor
- Lowest compatibility percentage among ecobee units at 85 percent
The Essential is the entry point into the ecobee app, and it keeps the two things that matter for a heat pump: a color touchscreen and explicit 2H/1C heat pump support. Most entry-level smart thermostats give you one or the other, not both.
It works with most 24 VAC equipment including gas, oil, electric, dual fuel, forced air and boilers, and free software upgrades keep the hardware current for years after purchase. eco+ adds schedule assistance, indoor humidity detection and time-of-use preheating.
At 4.2 across roughly 1900 reviews, it carries the lowest one-star share of the ecobee models here, which tells you the fit-and-finish complaints are not a big theme. Build quality and app experience draw most of the praise.
For Apple HomeKit households this is the cheapest route into the ecobee ecosystem, and time-of-use preheating can avoid peak-period recovery on a heat pump if your utility offers a rate plan.
Who the Essential fits
It fits a homeowner with a standard 2H/1C heat pump who wants a color screen and a polished app without the flagship sensor bundle. It is a good default for Apple HomeKit and Google Assistant users at the mid tier.
It also suits anyone who intends to keep the thermostat for many years, since free software upgrades reduce the odds of early replacement.
Where the Essential falls short
Compatibility is the narrowest of the ecobee line at 85 percent of systems, so run the manufacturer compatibility checker with your system type before buying. The Power Extender Kit and trim kit are separate purchases if you lack a C wire.
There is no built-in speaker, voice assistant or air quality monitor, and room-level monitoring requires SmartSensors bought separately.
10. Honeywell Home T5: Best for Utility Rebates and Demand Response
Honeywell Home T5 Smart Wi-Fi Thermostat
Geofencing
Monthly energy reports
Demand response eligible
2 year warranty
Pros
- Geofencing switches between Home and Away automatically
- Eligible for utility demand response programs
- Monthly energy reports with savings tips
- Supports Alexa and Apple HomeKit
- Compact square body fits tight walls
Cons
- C-wire adapter required on some systems
- Not compatible with heating-only oil furnaces without a C wire
- Monochrome LCD with no color display
- No occupancy sensing beyond geofencing
- Two year limited warranty
The T5 is the pick if your utility pays for thermostat participation. It carries a rebate finder and eligibility for local demand response programs, and on a heat pump those programs can pay more than the hardware cost when the grid is under stress.
Geofencing switches between Home and Away modes on its own as phones arrive and leave, and monthly energy reports with personalized savings tips make it easy to see whether your schedule changes are actually reducing usage.
Owners who lean on scheduling report savings in the range of 8 to 16 percent on heating and cooling bills, which sits close to the independently measured range rather than the marketing range. That makes it a good pick for people who actually adjust the schedule.
Alexa, Google Assistant and Apple HomeKit are all supported, and the compact square body at 4.06 inches wide fits walls where a larger rectangular plate will not.
Who the T5 fits
It fits owners on a utility rebate or demand response program, especially where the thermostat must support a specific utility protocol. It also suits anyone who wants geofencing without paying for occupancy radar.
It is a reasonable mid-range option for a ducted heat pump in a home with modest wall space, and it handles auto changeover between heating and cooling set points.
Where the T5 falls short
A C-wire power adapter is required on some systems, and heating-only oil furnaces will not work without a common wire. That excludes a real slice of older homes.
The display is a plain monochrome LCD with no customization, and the only occupancy detection is phone geofencing, so it cannot preheat based on radar presence. The warranty is two years.
11. Honeywell Vision Pro 8000: Best for Three-Stage Systems
Honeywell TH8321WF1001 Touchscreen Thermostat Wifi Vision Pro 8000 with Stages upto 3 Heat / 2 Cool
Up to 3 heat 2 cool
Remote sensor inputs
Humidity control
C-wire required
Pros
- Widest staging support here at up to three heat and two cool
- Humidity control with dehumidifier integration
- Auto switchover between heating and cooling
- Program assist learns recovery time
- Sturdy screw terminal connectors
- Owners report units lasting about a decade
Cons
- Requires a C wire with no battery backup
- Setup menu asks many system questions
- Only one remote sensor input
- Monochrome LCD looks dated beside color screens
If your heat pump is three-stage, this is the deepest staging support in the group at up to three heat and two cool. It is also listed as suitable for heat pump systems with electric or gas backup heat, which is exactly the configuration where staging errors cost you the most.
Program assist learns how long the house takes to recover and starts the system early enough to hit the set point on time. On a heat pump that is not a gimmick, because recovery time varies with outdoor temperature and the compressors ramp slowly.
Humidity control with dehumidifier integration is unusual at this level and pairs well with heat pumps in humid summers. Remote sensor inputs handle outdoor temperature and indoor averaging, and the Total Connect Comfort app works on a phone or in a browser.
Reviewers who understand HVAC systems rate this one very highly, and multiple owners report units still running after about a decade. The screw terminal connectors on the pro-series housing are equally well regarded.
Who the Vision Pro fits
It fits owners of a three-stage heat pump, a dual-fuel system with gas backup, or a setup where dehumidification and humidity control matter. It is also a good choice for a new construction install specified by a contractor.
It suits anyone who prefers an app with web browser access over mobile-only control, which is handy for managing equipment from a desktop.
Where the Vision Pro falls short
A C wire is required and there is no battery compartment for backup, so a power interruption can leave the system without control. The setup menu asks a long list of questions about the HVAC system and is recommended for professional installation.
There is only one remote sensor input, so multiple sensors must be wired together and read as a single average. The monochrome LCD looks dated next to color screens, and the body is heavier than modern smart thermostats.
12. Sensi Touch 2: The Modern Touchscreen Pick
Sensi Touch 2 Smart Thermostat Wi-Fi, Alexa, Energy Star Certified, ST76
LCD touchscreen
C-wire required
Room sensor ready
3 year warranty
Pros
- Bluetooth guided install makes wiring and pairing straightforward
- Modern touchscreen with a clean beveled edge
- Works with heat pumps furnaces boilers and AC
- Room Sensor compatible for balancing
- Three year warranty
Cons
- C wire required unlike the lower Sensi models
- Sensi Room Sensors sold separately
- No built-in occupancy sensor for preheating
- No air quality monitoring or built-in speaker
The Touch 2 is the Sensi model to buy if you want a modern touchscreen and expandable room sensors. It supports heat pumps, furnaces, boilers and air conditioning, so it carries over to a future system change without replacement.
Installation guidance runs over Bluetooth, which walks you through wiring and pairing in sequence. Several owners call this the smoothest install experience among the Sensi models.
Usage reports, equipment alerts and filter replacement reminders are all included with no subscription. Sensi states it does not sell personal information to third parties, which is a reasonable position for anyone wary of cloud-based control.
Alexa, Google Assistant and SmartThings support covers the mainstream ecosystems. The body is rectangular with a beveled edge in black or white, and the warranty runs three years.
Who the Sensi Touch 2 fits
It fits homeowners who want a clean touchscreen, three-year warranty coverage, and the option to add room sensors later for whole-home balancing. It works well alongside a home automation setup based on SmartThings.
It is also a reasonable pick for a new heat pump installation where you know a common wire will be present, since the C wire requirement is not an issue on new work.
Where the Touch 2 falls short
The common wire requirement is the headline limitation, and it is stricter than the lower Sensi models. Anyone without a C wire should go to the ST55 instead.
There is no built-in occupancy sensor, so no automatic preheating before you arrive, and no air quality monitor or speaker. Room Sensors are a separate purchase, which raises the real cost of good room balancing.
What to Look for When Buying a Smart Thermostat for a Heat Pump
First, confirm your heat pump will accept a third-party thermostat at all. Variable-speed communicating systems from Lennox, Carrier and Trane are designed to modulate compressor output, and the consensus among owners on r/heatpumps is that no universal thermostat can do this. If your system communicates, keep the manufacturer thermostat or buy a compatible replacement from the manufacturer.
Ductless mini-splits are a different category again. They typically use an infrared line-of-sight controller rather than 24V wiring, and none of the twelve units on this list is built for that application. Owners of ductless systems generally need a dedicated controller for their indoor unit.
Next, work out your staging requirement. Single-stage heat pumps need very little. Two-stage systems benefit from a thermostat that speaks 2H/1C, which most of these do. Three-stage systems and setups with humidification need something deeper, which is the Vision Pro territory.
Then check the power situation. A common wire, the C wire, is the 24V constant supply that keeps a smart thermostat alive when the HVAC system is idle. Several units here require it, some include a Power Extender Kit so you can avoid it, and others work without it most of the time. Do not guess on a heat pump, because power-stealing units behave badly on heat pump wiring.
If you are still deciding on the equipment side, our guides to the best well pumps for rural homes and the best pond pumps for koi ponds cover the same principle, which is that the right capacity beats the highest specification.
Finally, decide how much the smart features matter to you. Occupancy sensing, room sensors and air quality monitoring are real conveniences. They are not where the money is on a heat pump, and a well-configured schedule on a simpler unit will produce most of the same savings.
The C-Wire Question for Heat Pump Owners
If you already have a C wire, this is the easy case. Any unit on this list will install without extra hardware, and you can skip straight to comparing staging support and lockout controls.
If you do not have a C wire, you have two paths. Several manufacturers include a Power Extender Kit in the box, including the ecobee Premium, the ecobee Enhanced and the Sensi ST55, which mounts at the furnace and powers the thermostat from the equipment. The Honeywell T5 lists a C-wire adapter as required on some systems rather than included, so check before you commit.
The third path is power stealing, where the thermostat takes just enough power from the heating circuit to run itself. On a heat pump this is the option to avoid. Homeowners report random reboots, dropped Wi-Fi and phantom heat calls on heat pump wiring with power-stealing units. If your only wiring has no common line, either choose a unit with a Power Extender Kit or have an electrician run one.
How you run that wire depends on the property. In a rural home with a long equipment run the routing matters as much as the thermostat, and our guide to the best well pumps for rural homes walks through similar access constraints. If you are installing inside a reptile or pond setup where humidity and enclosure heat are the concern, the best reptile heat lamps guide covers that side.
Frequently Asked Questions
Can you put a smart thermostat on a heat pump?
Yes, as long as your system uses standard 24V low-voltage wiring. Most smart thermostats list heat pumps among supported uses, including the Sensi ST55, the Honeywell T9 and the ecobee line. Two exceptions matter: variable-speed communicating systems such as Lennox iComfort, Carrier Infinity and Trane ComfortLink need the manufacturer thermostat, and ductless mini-splits use infrared controllers rather than wired thermostats.
What is the best smart thermostat for a heat pump with auxiliary heat?
The Sensi ST55 is our pick for most ducted systems because it supports heat pumps, rarely needs a C wire, and exposes the auxiliary heat settings that let you control when backup heat fires. If your system has electric backup heat and you want a large readable screen with the settings visible at a glance, the Honeywell Home T9 is the alternative worth considering.
Is auxiliary heat bad for my heat pump?
It is not bad for the hardware, but it is expensive for your bill. Electric resistance strips deliver a coefficient of performance of 1.0, while the compressor manages roughly 3.40 at 47F and 2.25 at 17F per the NEEP cold-climate specification. That means strip heat can cost two to three times more per hour than compressor heat, which is why lockout settings matter so much.
Are there any smart thermostats that don’t require a C wire?
Several do, and the Sensi ST55 is the strongest example because it usually installs without one and still supports heat pumps. The ecobee Premium and Enhanced include a Power Extender Kit in the box, which mounts at the furnace and supplies power without a new wire. Thermostats that steal power instead can behave unreliably on heat pump wiring, so avoid those.
Why do HVAC guys dislike Nest thermostats?
The most common complaint is not the hardware but the configuration. On a heat pump system, Nest requires a C wire or power accessory, and some owners report trouble controlling when backup heat fires. The product documentation states this plainly, and several users describe moving away from Nest after auxiliary heat problems. Contractors also note the two-year-plus-old hardware design and limited support options.
Do smart thermostats actually save money on heat pumps?
Yes, but less than the marketing suggests. Manufacturer pages advertise up to 23 or 26 percent for ecobee and up to 20 percent for Nest, and those studies are vendor-funded. Independently measured heating savings from scheduling land closer to 10 to 12 percent. Keeping setbacks shallow at 2 to 4 degrees and raising the auxiliary heat lockout are what actually move a heat pump bill.
The Verdict for 2026
The Sensi ST55 is the best smart thermostat for heat pumps in 2026 because it handles the equipment correctly, rarely asks for a C wire, and leaves you in control of when auxiliary heat fires. The Honeywell Home T9 is the runner-up when you want backup heat settings on a large screen, and the ecobee Premium takes over when room-to-room comfort is the real problem.
Before you install anything, set the auxiliary heat lockout somewhere in the low 30s and adjust from your own runtime data. Keep your setbacks shallow and let the thermostat handle recovery timing. That setup work matters more than any feature on the spec sheet. If you are still deciding on backup equipment for a home with a pool, our guide to the best pool heat pumps for longer swim seasons covers a similar running-cost calculation.