Best Smart Thermostat (2026): 4 Picks to Cut Heating and Cooling Bills
Last updated: November 9, 2026
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Heating and cooling are usually the biggest part of a home energy bill, and a smart thermostat helps you spend less on them without feeling less comfortable. It learns or follows a schedule, turns the system down when nobody is home, and lets you adjust the temperature from your phone.
We compared four of the most popular smart thermostats on features, smart home support, sensors and warranty. Here is what we recommend in 2026.
Our top picks
| Thermostat | Standout feature | Score | Buy link |
|---|---|---|---|
| ecobee Smart Thermostat PremiumBest overall | SmartSensor included, built-in voice control | 9.2 | Check price |
| ecobee Smart Thermostat EnhancedBest for most homes | Radar occupancy sensing, works with SmartSensors | 9.0 | Check price |
| ecobee Smart Thermostat EssentialBest budget pick | Full-color screen, lowest price | 8.8 | Check price |
| Google Nest Learning Thermostat (4th Gen)Best for hands-off learning | Learns your schedule automatically | 8.7 | Check price |
The best smart thermostats, reviewed
ecobee Smart Thermostat Premium
- Voice controlSiri or Alexa built in (Siri needs an Apple HomePod as a home hub)
- Room sensorOne SmartSensor included
- Air qualityAir quality monitoring and alerts
- No C-wire?Power Extender Kit included
- Works withApple HomeKit, Amazon Alexa, Google Assistant, SmartThings
- Warranty3 years
- Savings claimUp to 26% (up to $284 a year), according to ecobee
The Smart Thermostat Premium is the most complete thermostat ecobee makes. A SmartSensor comes in the box, so you can put it in the bedroom and let the thermostat heat or cool the room you actually use.
You can talk to it directly, with Alexa or Siri built in. Siri needs an Apple HomePod to work. It also monitors indoor air quality and sends alerts, and it works with Apple HomeKit, Alexa, Google Assistant and SmartThings.
No C-wire? The Power Extender Kit is included. ecobee says it can save up to 26% on heating and cooling, but real savings depend on your home and climate.
What we like
- SmartSensor included for room-by-room comfort
- Alexa or Siri built in
- Power Extender Kit in the box
- Air quality monitoring and alerts
Watch out for
- Most expensive ecobee
- Siri needs an Apple HomePod
- Savings estimate is ecobee's own claim
Best for: Households that want the best comfort features and voice control in one thermostat.
Skip it if: You only want basic scheduling and a lower price.
Check price on Amazon Price range: $259.99
ecobee Smart Thermostat Enhanced
- Occupancy sensingBuilt-in radar sensor
- Room sensorsWorks with ecobee SmartSensors (sold separately)
- No C-wire?Power Extender Kit included
- Works withApple HomeKit, Amazon Alexa, Google Assistant, SmartThings
- Warranty3 years
- Savings claimUp to 26% on heating and cooling, according to ecobee
The Enhanced sits in the middle of the ecobee range, and it is the best fit for most homes. You get the same app and scheduling as the Premium for less money.
A built-in radar sensor notices when people are home or away and adjusts the temperature on its own. If some rooms run hot or cold, you can add SmartSensors later.
It works with Apple HomeKit, Alexa, Google Assistant and SmartThings. The Power Extender Kit is in the box, and ecobee backs it with a three-year warranty. What you give up is the Premium's built-in voice assistant and included sensor.
What we like
- Strong features at a mid-range price
- Built-in radar occupancy sensing
- Power Extender Kit included
- Works with all major smart home platforms
Watch out for
- No SmartSensor in the box
- No built-in voice assistant
- Check compatibility before buying
Best for: Most homeowners who want a great smart thermostat without paying for Premium extras.
Skip it if: You want the sensor and voice assistant included in the box.
Check price on Amazon Price range: $199.99
ecobee Smart Thermostat Essential
- DisplayFull-color touchscreen
- Works withApple HomeKit, Google Assistant, Amazon Alexa
- Room sensorsWorks with SmartSensors (sold separately)
- No C-wire?Power Extender Kit sold separately
- Warranty3 years
- Savings claimUp to 23% on heating and cooling, according to ecobee
The Smart Thermostat Essential is the cheapest way into the ecobee range. You still get a full-color touchscreen, the ecobee app and easy scheduling.
It works with Apple HomeKit, Google Assistant and Alexa, and you can add SmartSensors later. ecobee says it can cut heating and cooling costs by up to 23%. It may also qualify for utility rebates, which can lower the price further.
If your home has no C-wire, you need to buy the Power Extender Kit separately. Like every ecobee device, it has a three-year warranty.
What we like
- Lowest price in the ecobee range
- Full-color touchscreen and a good app
- Works with Apple, Google and Alexa
- May qualify for utility rebates
Watch out for
- Power Extender Kit costs extra
- No built-in voice assistant or air quality monitor
- Savings estimate is ecobee's own claim
Best for: Budget-conscious buyers who want solid app control and scheduling.
Skip it if: You want built-in voice control, an air quality monitor or a bundled sensor.
Check price on Amazon Price range: $139.99
Google Nest Learning Thermostat (4th Gen)
- Standout featureLearns your schedule and builds one for you
- Room sensorNest Temperature Sensor included (up to 6 supported)
- Smart homeGoogle Home; Matter-certified
- DesignRound design with a large, rotating dial
- CompatibilityCheck Google's compatibility checker before buying
The Nest Learning Thermostat is the pick if you want a thermostat that mostly runs itself. Adjust it a few times, and it learns your routine and builds a schedule for you.
The 4th gen comes with a Nest Temperature Sensor for a second room, and it supports up to six. It is Matter-certified, so it works beyond Google Home too.
Run Google's compatibility checker before you buy, because not every heating and cooling system works with every thermostat.
What we like
- Learns your schedule with little setup
- Temperature sensor included
- Matter-certified
- Distinctive design with a large dial
Watch out for
- Premium price
- Learning can take time to get right
- Best experience is in the Google Home app
Best for: People who want a thermostat that learns their routine and needs minimal tweaking.
Skip it if: You want built-in voice control or air quality alerts.
Check price on Amazon Price range: See retailers
Side-by-side comparison
| ecobee Smart Thermostat Premium | ecobee Smart Thermostat Enhanced | ecobee Smart Thermostat Essential | Google Nest Learning Thermostat (4th Gen) | |
|---|---|---|---|---|
| Best for | Best overall | Best for most homes | Best budget pick | Best for hands-off learning |
| Smart home support | HomeKit, Alexa, Google Assistant, SmartThings | HomeKit, Alexa, Google Assistant, SmartThings | HomeKit, Google Assistant, Alexa | Google Home, Matter |
| Room sensors | SmartSensor included | Supported (sold separately) | Supported (sold separately) | Nest Temperature Sensor included |
| Built-in voice | Alexa or Siri | No | No | No |
| Without a C-wire | Power Extender Kit included | Power Extender Kit included | Power Extender Kit sold separately | Check Google's compatibility tool |
| Warranty | 3 years | 3 years | 3 years | See Google Store |
| Price | $259.99 | $199.99 | $139.99 | See retailers |
| Our score | 9.2 | 9.0 | 8.8 | 8.7 |
How to choose a smart thermostat
1. Check that it works with your heating and cooling system
Before buying, check your wiring and the compatibility checker on the thermostat maker’s website. Some thermostats need a C-wire (common wire) for constant power. If you do not have one, look for an adapter such as a power extender kit.
2. Decide how much control you want
Learning thermostats such as the Nest build a schedule for you. ecobee models let you set schedules and adjust them in the app. Think about whether you prefer to set it and forget it or fine-tune the details.
3. Consider room sensors
A thermostat measures the temperature only where it hangs. Room sensors let it heat or cool based on the rooms you use, which helps if some rooms are always too hot or too cold. The ecobee Premium includes one SmartSensor, the Enhanced and Essential work with them, and the Nest Learning Thermostat comes with a Nest Temperature Sensor.
4. Match your smart home ecosystem
If you use Apple Home, check for HomeKit support. If you use Google Home, a Nest or an ecobee with Google Assistant fits. If your house runs on Alexa, most models work, and some have Alexa built in.
5. Look for rebates and warranty
Many utilities offer rebates on smart thermostats, which can cut the price noticeably. Also compare the warranty: all ecobee devices carry a three-year manufacturer’s warranty.
Frequently asked questions
Do smart thermostats really save money?
They can. Manufacturers estimate savings such as ecobee’s up to $250 to $284 a year on heating and cooling, but real savings depend on your climate, home and habits. The biggest gains come from not heating or cooling an empty house.
Do I need a C-wire for a smart thermostat?
Many smart thermostats want a common wire for steady power. If your system does not have one, some models include or sell an adapter, such as ecobee’s Power Extender Kit. Check the compatibility tool before you buy.
Can I install a smart thermostat myself?
Many people do. Turn off power to your heating and cooling system at the breaker, take a photo of the wiring, and follow the maker’s app instructions. If you are unsure, an electrician or HVAC technician can do it for you.
Will a smart thermostat work with Alexa, Google or Apple?
Most do. The ecobee Premium works with Apple HomeKit, Alexa, Google Assistant and SmartThings, the Enhanced with the same four, and the Essential with Apple HomeKit, Google Assistant and Alexa. The Nest Learning Thermostat works with Google Home and is Matter-certified.
What is the best smart thermostat for most homes?
For most homes, the ecobee Smart Thermostat Enhanced offers the best balance of features and price. Choose the Premium if you want the sensor and voice control included, or the Essential to spend less.
The bottom line
For most homes, the ecobee Smart Thermostat Enhanced hits the sweet spot, while the ecobee Premium is our top overall pick if you want the included SmartSensor and built-in voice control. On a budget, the ecobee Essential is the easiest way in. And if you want a thermostat that learns your routine on its own, the Google Nest Learning Thermostat is the one to buy.
Looking for more ways to save energy? Browse all our Energy Savings guides, or ask us a question.
