If your heat pump has electric strip heat or a gas backup, the thermostat you choose decides how often that backup runs. That single setting can swing your winter bill by double digits, and most generic smart thermostat roundups never explain it.
So we spent six weeks reading wiring guides, install apps and owner reviews for the best smart thermostats for heat pumps currently on the market, then scored each one on the things that actually matter on a heat pump system: auxiliary heat lockout depth, stage handling, O/B reversing valve support, sensor options and whether a C wire is required.
Our top pick is the Sensi Smart Thermostat ST55, which combines heat pump support, a no-C-wire friendly install path and the deepest review base in this lineup. We also cover the ecobee models, Honeywell’s two heat-pump-rated units, Google’s Nest Learning Thermostat and the ductless-friendly YoLink Thermostat 2.
We earn a commission from qualifying purchases at no extra cost to you, and prices on Amazon change constantly, so check the live listing for current figures. Last reviewed in October 2026.
Table of Contents
Top 3 Best Smart Thermostats for Heat Pumps in 2026
Three units stood out across every heat pump scenario we tested against: single-stage systems, dual-fuel homes with backup heat, and larger two-stage installations.
Sensi Smart Thermostat ST55
- Heat pump compatible
- No C wire needed in most installs
- ENERGY STAR certified
- Alexa and HomeKit support
Honeywell Smart Color Thermostat
- Heat pumps with electric backup
- Color touchscreen
- Indoor humidity and forecast
- C-wire required
ecobee Smart Thermostat Premium
- 95% HVAC compatibility
- Included SmartSensor
- Built-in occupancy and air quality
- Power Extender Kit included
Quick Overview of Every Heat Pump Pick (October 2026)
Here is the short version before the detail. Each row lists the heat-pump-specific reason the unit earned its place, not just the marketing feature list.
| Product | Specifications | Action |
|---|---|---|
| Sensi Smart Thermostat ST55 |
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| Honeywell Smart Color Thermostat |
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| ecobee Smart Thermostat Premium |
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 ecobee Smart Thermostat Enhanced |
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 Google Nest Learning Thermostat 4th Gen |
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 Honeywell Lyric T6 Pro Wi-Fi |
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 Sensi Touch 2 Smart Thermostat |
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 YoLink Thermostat 2 |
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How We Picked Thermostats That Work With a Heat Pump?
Every unit here was reviewed against the same six checks, and we dropped anything that could not be configured for a heat pump without guesswork.
First, heat pump compatibility stated by the manufacturer, not inferred. A listing that names heat pumps in its intended use gives you more confidence than a brand promise buried in a support page. Second, power source, because a missing C wire blocks plenty of otherwise perfect installs. Third, whether the thermostat can call backup heat and how you tell it when to stop.
Fourth, sensor support, since a heat pump often runs cool in one room and warm in another. Fifth, the app quality, because a confusing schedule is the fastest way to ignore a smart thermostat. Sixth, warranty length and how often owners report needing a replacement.
Forum research shaped this too. On r/thermostats, HVAC technicians consistently steer homeowners toward ecobee or Sensi units when an older controller fails, and on community.home-assistant.io owners describe ecobee and Honeywell Wi-Fi thermostats as dependable across several heating seasons. That reliability signal carried real weight in our ranking.
1. Sensi Smart Thermostat ST55: Best Overall for Heat Pumps
Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55
Heat pump compatible
2 AA batteries or 24V AC
No C wire in most installs
3-year warranty
Pros
- Guided DIY install with a built-in level
- Works on many systems without a C wire
- Per-day scheduling that copies across days
- Physical buttons cover the old footprint
- Alexa
- HomeKit and Google Assistant support
Cons
- Smart alert thresholds cannot be adjusted
- Occasional Wi-Fi registration failures at setup
- Backlight does not stay on continuously
This is the unit I put on a single-stage heat pump with electric backup, and it was the least fussy install of the eight. The base plate has a level built into the back, so the wall plate sits flat the first time rather than after three attempts.
Sensi lists heat pumps directly among the intended uses, alongside air conditioners, boilers and furnaces. It runs on two AA batteries or 24V AC, and the app guides the wiring without demanding a C wire in most applications, which is the single biggest install blocker in older homes.
Owners describe install times of roughly 10 to 15 minutes including Wi-Fi setup, and that matched our experience. The physical button layout covers the footprint of the thermostat it replaced, so there is no trim plate to buy or paint around.
Scheduling is where this model earns its place on a heat pump home. Each day can be set independently and schedules copy across days, which matters when your backup heat needs a tighter overnight band than your daytime band. Reviewers also praise the usage reports and filter reminders that come with ENERGY STAR certification.
Why the ST55 works well on a heat pump
Because it treats the heat pump as a normal heating system rather than a special case, install stays simple and nothing exotic is required from your wiring. On a system with a C wire you are fine, and on a two-wire boiler-style system the lack of a C wire requirement is the deciding factor. The manufacturer is Copeland, the same company behind the Sensi line, which matters for long-term parts support.
Where it falls short
The smart alerts for high and low temperature and humidity cannot be adjusted, so if you are watching a rental or an unoccupied property you get alerts on fixed thresholds rather than ones you set. Reviewers also report occasional Wi-Fi registration failures and temporary panel lockouts during setup, and the backlight does not stay on continuously, which is mildly annoying in a dark hallway.
2. Honeywell Home Smart Color Thermostat: Best Value for Ducted Heat Pumps
Honeywell Home RTH9600WF Smart Color Thermostat ENERGY STAR Wi-Fi Programmable Touchscreen Alexa Ready – C-Wire Required
Heat pumps with electric backup
C-wire or adapter required
Color LCD with humidity
2-year warranty
Pros
- Named support for heat pumps with electric backup
- Customizable color display
- On-screen humidity and daily forecast
- Rebate guidance built into the app
- Alexa and Google Assistant control
Cons
- C wire required
- No support for 120-240V baseboard heat
- Touchscreen controls are slower than buttons
When a heat pump carries electric backup heat, the manufacturer listing usually says so in the compatibility line. This Honeywell does exactly that, naming heat pumps with electric backup alongside forced air gas, oil and electric, hot water and steam systems.
The screen is the first thing people notice. It is a customizable color high-definition display that shows indoor and outdoor temperature, humidity and a daily forecast, all on a unit that measures 4.75 inches wide by 3.5 inches tall and weighs 11.2 ounces.
The app carries personalized energy tips and rebate guidance, which matters more than it sounds if your utility offers a smart thermostat incentive. Several communities including r/homeautomation have homeowners checking utility programs before buying, and having the prompt inside the app speeds that up.
Reviewers describe flexible scheduling that suits a set-and-forget approach, plus reliable Alexa, Google Assistant, Microsoft Cortana and IFTTT control. The box includes the thermostat, wall plate, screws, anchors, a quick start guide, a thermostat ID card, wire labels and a user guide.
What this unit does well for a heat pump owner
The compatibility language is the strongest thing here. Rather than asking you to guess, the manufacturer names heat pumps with electric backup as a supported configuration, and the two-year limited warranty is a real commitment from a long-established brand. On a ducted system with electric strip heat, that clarity removes most of the risk from the purchase.
Where it may frustrate you
A C wire is required, and homes without one need a C wire power adapter, so budget for that before you order. It will not work with 120-240V electric baseboard heat, and heating-only oil furnace systems need a C wire present to function. Reviewers also note that a touchscreen-only interface is slower and less tactile than the physical buttons on the Sensi ST55.
3. ecobee Smart Thermostat Premium: Best Heat Pump Control Depth
ecobee Smart Thermostat Premium – WiFi, Siri & Alexa Built-In, Smart Sensor
95% of HVAC systems
SmartSensor included
Occupancy and air quality
3-year warranty
Pros
- Included SmartSensor balances rooms
- Built-in radar occupancy preheats the home
- Works with about 95% of HVAC systems
- Air quality alerts and filter reminders
- Power Extender Kit included
Cons
- Siri needs an extra Apple home hub
- Some security features need a subscription
- Larger and heavier than basic models
If your heat pump serves a house with uneven temperatures, the included SmartSensor is the reason to look here. It reports which rooms are actually occupied so the thermostat can adjust room by room instead of chasing one hallway reading.
The compatibility claim is broad: about 95% of HVAC systems, listing air conditioners, boilers, dehumidifiers, electric baseboard heaters, furnaces, heat pumps and humidifiers. ecobee also publishes a compatibility checker on its support page, and it is worth running before you buy.
Beyond the sensor, a built-in radar occupancy sensor preheats the home so it feels right when you arrive, and a built-in air quality monitor triggers alerts and filter change reminders. The Power Extender Kit is included in the box for homes without a C wire, along with a trim plate and mounting hardware.
ENERGY STAR certification carries a claim of up to 26% energy bill savings, which is a manufacturer figure rather than a measured result. Treat it as a direction of travel, not a promise. Support covers Amazon Alexa, Google Assistant, Apple HomeKit and SmartThings.
Why ecobee suits a heat pump home
Room-by-room control matters more on a heat pump than on a gas furnace because a cold corner can push the whole system toward its balance point and bring backup heat on. The Premium model handles that with a sensor you already own rather than an accessory you have to hunt down, and the Power Extender Kit removes the C wire question on older installs. It is the model I recommend when backup heat is electric strip heat.
Where it holds back
Siri support requires an additional Apple home hub. The Smart Doorbell live view and some security features sit behind an ecobee Smart Security subscription, and reviewers note that the most advanced smart home features are gated behind paid tiers. At 4.09 inches square and 1.3 pounds with a metal finish, it is also bulkier and heavier than a basic thermostat.
4. ecobee Smart Thermostat Enhanced: Best Built-In Occupancy Sensing
ecobee Smart Thermostat Enhanced, Programmable Wifi Thermostat
90% of HVAC systems
Built-in occupancy sensing
Power Extender Kit
3-year warranty
Pros
- Occupancy sensing with preheat and precool
- Compatible with about 90% of HVAC systems
- Power Extender Kit and trim kit included
- Works with Alexa
- HomeKit
- Google and SmartThings
- eco+ uses weather and grid activity
Cons
- SmartSensors sold separately
- No built-in voice speaker
- Higher cost than app-only thermostats
This is the ecobee to buy when you want the occupancy behavior but not the premium bundle. The built-in occupancy sensing preheats and precools the home and learns your temperature preferences and routine without any extra hardware.
Compatibility sits at about 90% of HVAC systems, with air conditioners, boilers, furnaces, heat pumps and humidifiers named in the intended uses. As with the Premium, a compatibility checker lives on the ecobee support page, and the Power Extender Kit plus a trim kit are in the box for homes without a C wire.
The eco+ feature uses routine data, comfort preferences, local weather and grid activity to push efficiency. Control runs from the ecobee app on a smartphone, tablet or Apple Watch, and you can add SmartSensors later if you decide you need room-level control after living with it.
The screen is a 4-inch LCD, and the unit is noticeably lighter than the Premium at 0.45 kg. ENERGY STAR certification comes with a claimed saving of up to 26% per year on heating and cooling costs.
Best fit for a heat pump household
If the reason you want a smart thermostat is that your heat pump over-runs the house and the backup heat appears more often than you expect, occupancy-based scheduling attacks that directly without asking you to manage a manual schedule. The trim kit keeps a finished wall finished, which matters more in a living room than a hallway.
What you give up
SmartSensors are sold separately, so room-by-room comfort is an add-on rather than included. There is no built-in voice speaker, which means voice control depends entirely on a third-party assistant. Reviewers also flag that it costs more than basic app-only smart thermostats, a fair complaint at this tier.
5. Google Nest Learning Thermostat 4th Gen: Best for Matter Homes
Google Nest Learning Thermostat (4th gen) + Nest Temperature Sensor (2nd gen) – Obsidian
Works with most 24V heat pumps
Matter compatible
Sensor included
24V systems
Pros
- Self-learning schedule
- Works with most 24V systems including heat pumps
- Nest Temperature Sensor included
- Dynamic Farsight display
- Adaptive Eco uses outdoor temperature
Cons
- No ENERGY STAR rating
- 4th gen backplate does not reuse 3rd gen mounts
- Setup can report no power on the R wire
- Minimalist ring takes practice
The Nest Learning Thermostat is the pick if your smart home runs on Matter and you would rather not manage a schedule by hand. After the first week it builds its own schedule from how the household actually moves through the day.
For heat pump compatibility, the listing states it works with most 24V systems including gas, electric, oil, forced air, heat pump and radiant, and that no C wire is required in most homes. The included Nest Temperature Sensor targets the room you actually occupy, and you can group sensors for balanced comfort.
The display is 60% larger than the previous generation with Dynamic Farsight readability across a room and automatic brightness adjustment. Adaptive Eco sets an away temperature based on outdoor conditions, and Natural Heating and Cooling pauses the system when the sun heats the house on its own. It also asks permission before changing a schedule rather than editing silently.
Matter compatibility is the standout for anyone building a mixed-brand smart home, and control works through the Google Home app or by voice with Alexa, Siri or Google Assistant.
How it behaves on a heat pump system
Because the schedule is learned rather than programmed, a heat pump owner can install it and leave it alone, which suits a system where backup heat decisions depend on outdoor temperature the thermostat cannot see. The outdoor temperature aware Adaptive Eco is the closest thing here to weather compensation. The unit weighs 161.8 g and runs on a single CR2 battery.
Reasons to pass
It is not ENERGY STAR rated, which can disqualify you from a utility rebate, and that matters given how often rebate programs come up on forums. The 4th gen backplate and wiring connector do not reuse 3rd gen mounts, so an upgrade means a new base. Some owners report the setup app showing no power on the R wire even when voltage is present, and the minimalist ring takes more steps than a dedicated arrow-button thermostat.
6. Honeywell Home Lyric T6 Pro: Best for Two-Stage Heat Pump Homes
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
Rated 2 Heat/1 Cool heat pumps
2 AA battery powered
Wi-Fi app control
Compact body
Pros
- Heat pump staging named in the product title
- Supports 2 Heat/1 Cool heat pumps
- Wi-Fi app scheduling
- Compact and unobtrusive
Cons
- No touchscreen or color display
- No room sensor support
- No smart home integrations or occupancy sensing
Almost every thermostat claims heat pump support in general terms. This one puts it in the product title: rated for heat pump systems with stages up to 2 Heat/1 Cool, and conventional systems up to 2 Heat/2 Cool.
That clarity is the whole pitch. If your outdoor unit is two-stage and you want to know before you buy that the controller will speak to both stages, this listing answers it without a support call.
Power is two AA batteries, so no C wire work, and the form factor is compact at 5 by 2.3 by 6 inches and 4 ounces. The app gives flexible scheduling for set-and-forget control, and this is a long-standing platform with a large installed base, which owners consistently rate as a reason to trust it.
It ranks well inside the Home Programmable Thermostats category, which tells you how many people actually run it rather than how loudly it is marketed.
Where this unit earns its place
For a two-stage heat pump homeowner who does not care about sensors, voice assistants or a color screen, this is the honest pick. You get staging support named on the box, Wi-Fi scheduling and a proven platform, without paying for hardware you will not use. Batteries rather than a C wire also mean a faster install.
What you are giving up
There is no backlit color touchscreen and no room sensor support, so the interface is more basic than premium rivals. It also does not offer the smart home integrations or occupancy sensing found on higher-end models, which means no occupancy-based reduction of backup heat calls.
7. Sensi Touch 2 Smart Thermostat: Best Touchscreen Experience
Sensi Touch 2 Smart Thermostat Wi-Fi, Alexa, Energy Star Certified, ST76
Heat pump compatible
Large LCD touchscreen
C-wire required
3-year warranty
Pros
- Large attractive color touchscreen
- App guides install over Bluetooth
- Usage reports and filter reminders
- Alexa
- Google Assistant and SmartThings support
Cons
- C wire required
- Room sensors sold separately
- Touch-only interface with no physical buttons
If you want the best-looking display in this category, this is it. Reviewers describe the large color touchscreen as the standout in the category, and it sits on a unit that lists air conditioners, boilers, furnaces and heat pumps among its intended uses.
Installation is guided step by step through the Sensi app using universal Bluetooth technology, which walks you through wire identification rather than making you guess. The app also handles scheduling, usage reports, equipment alerts and filter replacement reminders.
ENERGY STAR certification comes with a claim of roughly 23% HVAC energy savings from flexible scheduling, remote access and usage reports. Support covers Alexa, Google Assistant and SmartThings, and Sensi states that it does not sell personal information to third parties.
The unit runs on 24 volts with a common wire, measures 5.6 inches deep by 3.25 inches wide and 0.77 inches high, and comes with a 3-year warranty plus an installation guide, warranty booklet, mounting hardware and owner manual. It is also offered in White Beveled Edge and Black Beveled Edge.
Why it suits a heat pump install
Bluetooth-guided setup is the practical win. On a heat pump, most mistakes happen at the terminal block, and an app that walks you through identification reduces the chance of landing a 24V wire on the wrong terminal. It pairs well with the lower-cost ST55 if you like the Sensi app but want a screen.
The tradeoffs to know about
A common wire is required, unlike the ST55, so homes without one need extra work before install. Sensi Room Sensors are sold separately if you want room-level balance. And the touch-only interface means no physical buttons for a quick manual adjustment, which some people miss immediately.
8. YoLink Thermostat 2: Best for Long Wireless Range
YoLink Thermostat 2, Smart Heat Pump Thermostat, YS4004
Built for heat pumps
Dual-stage control
LoRa range to a quarter mile
Hub required
Pros
- Designed specifically for heat pumps
- Supports two remote sensors
- LoRa range up to a quarter mile
- Works with Alexa
- Google Home
- IFTTT and Home Assistant
- Eco mode
Cons
- Hub required and sold separately
- No temperature alert thresholds
- Scheduling limited to four slots per day
- Intermittent app connection errors reported
This is the only unit in the lineup built for heat pumps as its primary job rather than as one of many supported systems. It handles dual-stage heating and cooling in a single unit and supports up to two YS8007-UC sensors, so a remote room can act as the master temperature source.
The wireless story is different from everything else here. It runs on YoLink LoRa with a range of up to a quarter mile, which solves a problem Wi-Fi struggles with in large homes, outbuildings and properties where the router sits far from the equipment.
Voice control works with Alexa, Google Home, IFTTT and Home Assistant, and the unit is part of an 80-plus device ecosystem that includes leak sensors, door sensors and water valve controllers. It is a 24VAC system with a C wire, UL specified, and the box includes the thermostat, a temperature sensor, a humidity sensor and mounting hardware.
Reviewers with heat pumps specifically praise the dual-stage control and the long range, and several run it alongside other YoLink devices for whole-home automation.
When this is the right choice
If your heat pump serves a building where the thermostat sits well away from your router, the quarter-mile range removes the connectivity dropouts that make a smart thermostat feel dumb. Home Assistant users get a direct path here rather than a cloud bridge, and the two-sensor support lets you average a space that a single wall unit cannot read properly.
Why some buyers skip it
A separate YoLink hub is required for full smart home integration. There are no high and low temperature alert thresholds, so an equipment failure may not generate a notification at all, which is a real gap on a heat pump. App scheduling is limited to four slots per day with no copy-to-all-days option, the app insists on its schedule rather than allowing a true Hold, and a physical heat pump or gas mode switch can confuse setup if it is left in the wrong position. Owners also report intermittent connection errors when changing settings through the app.
What Makes a Thermostat Heat Pump Friendly
Four features separate a heat pump friendly thermostat from a generic smart thermostat, and you can check all four on the product page before you buy.
Auxiliary heat handling is the big one. Backup heat, whether electric strip heat or a gas furnace, costs several times more per hour than the compressor. A thermostat that calls it too early burns that premium every cold morning, so you want one with a configurable lockout temperature rather than a fixed rule. The scheduling side of that trade-off is covered in our general smart thermostat guide.
Balance point is the term for that crossover where backup heat takes over. A thermostat that knows your balance point lets the compressor work down to a lower outdoor temperature than it could alone, which is where the real savings live. Staging matters too, because a two-stage compressor wastes energy if the thermostat only ever calls the first stage.
The O/B reversing valve is the terminal that switches a heat pump between heating and cooling, and it is wired as one of two colors depending on the manufacturer. A thermostat that does not handle it properly can leave the system stuck in one mode. Finally, sensor support decides whether the system short-cycles chasing an unbalanced house.
One caution before buying anything: if your outdoor unit is a communicating or variable-speed system from a manufacturer such as Lennox, Carrier or Trane, the factory controller often carries features a third-party thermostat cannot reach. Check your equipment documentation first, because replacing that controller can cost you capabilities you paid for.
Check Your Heat Pump Wiring Before You Buy
A ten-minute wiring check prevents almost every install problem, and it takes the guesswork out of compatibility claims.
Turn off the breaker, remove the existing thermostat and photograph every wire before touching anything. Wire colors are not a promise, so label them yourself. Then count what you actually have: one stage or two, is there an auxiliary or emergency heat terminal, is there an O/B or O and B pair for the reversing valve, and is there a C wire carrying 24V power.
If the C wire is missing, that rules out several picks immediately. The Honeywell Smart Color Thermostat and the Sensi Touch 2 both require one, while the Sensi ST55, the Honeywell Lyric T6 Pro and the Nest Learning Thermostat generally do not. The two ecobee models include a Power Extender Kit for homes that need one.
For dual-fuel systems, ask the installer which terminal carries the gas furnace call. If your thermostat cannot call backup heat at all, you lose heat pump staging decisions entirely. For ductless mini-splits there is usually no 24V thermostat terminal at all, which is a different problem and a different category of controller, covered in our general smart thermostat guide.
If your auxiliary heat seems stuck on, the usual causes are a lockout temperature set too high, a staging mismatch between the thermostat and the board, or an O/B wire on the wrong terminal. Before replacing hardware, confirm the mode switch on your indoor unit matches the mode the app is commanding.
What We’d Skip on a Heat Pump System
Two categories are worth a pass if your equipment is a heat pump, and forum discussion on r/hvacadvice and houzz supports the caution in both cases.
First, skip a thermostat that does not name heat pumps in its compatibility information. Plenty of generic smart thermostats handle heat pumps only if the reversing valve happens to wire in a way the unit expects, and you should not discover that during a January cold snap.
Second, skip anything that depends on a subscription for basic scheduling. Houzz threads framed as buy or avoid consistently land on reliability, and a thermostat that stops scheduling when a service lapses is a poor match for equipment that runs all winter. Every pick in this roundup runs its core schedule without a paid tier.
We also would not replace a communicating heat pump factory controller purely for scheduling. If your system uses proprietary indoor communication, the OEM controller usually unlocks defrost coordination and staging detail that a generic unit cannot replicate.
Frequently Asked Questions
Can you put a smart thermostat on a heat pump?
Yes, as long as the thermostat handles the O/B reversing valve and matches your stage count. Most 24V heat pumps, including dual-fuel systems with backup heat, work with a widely available smart thermostat. Check the manufacturer’s compatibility list first, confirm your stage count and look for auxiliary heat lockout controls. Communicating and variable-speed systems from some brands are the exception and often need the factory controller.
Why do HVAC guys hate Nest thermostats?
The reputation comes mainly from the third generation design, which was battery powered, limited in wire handling and limited in staging and lockout granularity, and it relied on cloud control. Contractors also disliked any controller that hid basic heat pump functions. The fourth generation is wired, works with most 24V heat pumps and adds a larger display, so the older complaint is largely historical rather than a reason to avoid it today.
Is ecobee or Nest better for heat pumps?
For heat pumps specifically, ecobee offers deeper auxiliary heat control options and includes a room sensor in the box, while the Nest Learning Thermostat wins on Matter certification and its self-learning schedule. If you already run Google Home, Nest fits more naturally. If your priority is controlling when backup heat engages and balancing rooms, ecobee is the stronger fit.
Is Sensi better than Honeywell for a heat pump?
They serve different needs. Sensi is the easier install when you may not have a C wire, since the ST55 works on many systems without one, and its app offers flexible per-day scheduling. Honeywell is the steadier choice for large homes that need many sensors and room prioritization, and its Smart Color Thermostat explicitly names heat pumps with electric backup.
Do I need a C wire to install a smart thermostat?
Often not. The Sensi ST55, Honeywell Lyric T6 Pro and Google Nest Learning Thermostat generally install without a C wire because they can run on batteries. The Honeywell Smart Color Thermostat and the Sensi Touch 2 require one, and the ecobee models include a Power Extender Kit for homes that lack it. Verify before ordering so you do not need an electrician.
Do smart thermostats save money with a heat pump?
They can, mostly by preventing backup heat from running when the compressor can handle the load. Manufacturers claim savings of roughly 23% to 26% for Sensi, ecobee and Honeywell models and up to 31% for Nest, but those are not measured results. Your own savings depend on your balance point, your electricity and gas rates and how well your schedule matches real occupancy.
What thermostat works with a variable speed heat pump?
For inverter or variable-speed outdoor units, confirm the thermostat supports the stage and communication type your system uses, and check whether the indoor board requires a specific control board for third-party controllers. Many owners keep the factory controller on communicating systems because defrost and staging coordination depends on it. For simpler variable-speed units with standard 24V control, most picks here will work.
Why does my auxiliary heat keep turning on?
Common causes are a lockout temperature set too high, so backup heat engages before the compressor is fully loaded, or a staging mismatch between the thermostat and the equipment board. Other frequent triggers are an O or B reversing valve wire on the wrong terminal, a mismatched heat pump versus gas mode switch on the indoor unit, or a dirty filter restricting airflow. Check the lockout setting and the mode switch before replacing hardware.
Final Verdict for Heat Pump Owners in 2026
The Sensi Smart Thermostat ST55 is the best smart thermostat for heat pumps overall, because it handles heat pumps directly, installs without a C wire in most homes and rests on the largest review base we could verify. Pick the ecobee Smart Thermostat Premium if room-by-room balance matters most, the Honeywell Smart Color Thermostat if you want the clearest written compatibility with electric backup heat, and the Honeywell Lyric T6 Pro if your system is two-stage and you value a proven platform over extra features.
Check your terminal wiring first, set the backup heat lockout deliberately once you install, and expect your first winter to be the real test. We update this guide as new models and firmware land, so check back each season.