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You can control an Alexa-compatible thermostat with an Echo by connecting the thermostat in the Alexa app, then using voice commands, app controls, or routines. For Amazon Smart Thermostat, the setup path is Devices > Add Device > Thermostat > Amazon. Check HVAC and wiring compatibility before installation; the Amazon model requires a C-wire and 2.4 GHz Wi-Fi.
Check compatibility before installing
Thermostat setup depends on your HVAC system as well as the Alexa connection. For Amazon Smart Thermostat, first use Amazon’s system compatibility guidance. The thermostat supports air-to-air and geothermal heat pumps, but not heat pumps paired with a gas or oil backup furnace (dual fuel). It requires a C-wire, also called a common wire; Amazon says an adapter may provide the required connection in some cases.
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Check the thermostat manufacturer’s compatibility information for a third-party model. Alexa support does not mean every thermostat works with every HVAC system or offers the same controls.
Connect an Amazon Smart Thermostat
- Check the system and wiring. Confirm that your HVAC system is supported and identify whether a C-wire is present. Review Amazon’s wiring instructions before opening the thermostat.
- Open the thermostat setup flow. In the Alexa app, go to Devices > Add Device > Thermostat > Amazon.
- Choose the installation status. Select No if the thermostat is not installed; the app provides guided installation and wiring directions. Select Yes if it is already installed to continue with Wi-Fi and Alexa setup. See Amazon’s setup instructions.
- Complete the guided steps. Follow the app’s directions for wiring, Wi-Fi, and connection. Once setup is complete, the thermostat appears among your Alexa devices.
Stay safe around HVAC wiring
Turn off HVAC power at the breaker or primary switch and verify it is off before removing the thermostat faceplate. Photograph the existing wiring and label the connections before disconnecting anything. If you are unsure about the wiring or installation, contact an HVAC service company.
#1 Best Overall
- An Alexa thermostat - Amazon Smart Thermostat is an easy way to switch from a traditional thermostats for homes and help reduce energy usage.
- Create comfort zones throughout your home by connecting to select Alexa devices to automatically adjust heating and cooling based on temperature readings or presence detection.
- Save money and energy - After purchase, Amazon will send you an email with details about home thermostat rebates that may be available from energy providers in your area.
- Save energy - According to EPA estimates, ENERGY STAR certified thermostats save an average of $90 on yearly energy bills.
- Programmable thermostat and automatic control - Create your own home, away and sleep schedules, or have Alexa automatically control the temperature with Alexa+ advanced features.
If there is no C-wire, do not assume an adapter will work with every system. Check the model and system requirements first; Amazon’s C-wire adapter instructions describe an adapter as a way to supply the thermostat’s required power wire.
Connect another Alexa-compatible thermostat
For a thermostat from another brand, verify that the exact model supports Alexa, then use the Alexa app’s device discovery flow:
Rank #2
- The information below is per-pack only
- An Alexa thermostat - Amazon Smart Thermostat is an easy way to switch from a traditional thermostats for homes and help reduce energy usage.
- Create comfort zones throughout your home by connecting to select Alexa devices to automatically adjust heating and cooling based on temperature readings or presence detection.
- Save money and energy - After purchase, Amazon will send you an email with details about home thermostat rebates that may be available from energy providers in your area.
- Save energy - According to EPA estimates, ENERGY STAR certified thermostats save an average of $50 on yearly energy bills.
- Open Devices and select the + button.
- Choose Add Device, select the device type and brand, and follow the prompts.
- Complete any manufacturer account-linking steps and consult that brand’s instructions for supported voice commands and features.
Amazon describes the general process in Connect Smart Home Devices to Alexa. The labels or account-linking steps can differ by thermostat brand.
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Use Alexa voice control
After setup, ask Alexa to change the temperature or operate a supported thermostat function. The exact commands depend on the thermostat and its Alexa integration, so check the manufacturer’s instructions if a command is not recognized.
Rank #3
- Save up to 23% every year on heating and cooling costs, adjusts to your set schedule to save energy when you’re gone and optimize comfort when you’re home. Compared to a hold of 72
- Compatible with 85% of systems, check your system’s compatibility with our online ecobee Compatibility Checker on the ecobee support page
- Change your temperature by easily tapping the color touchscreen or using the ecobee app. Plus, free software upgrades ensure you get the best out of your Smart Thermostat Essential, for years to come
- Automatically adjusts to your set schedule to save energy when you’re gone and optimize comfort when you’re home. Keep track of your energy consumption when you're on the go on the ecobee app
- Easy DIY install. No C Wire, no problem. Get the ecobee Power Extender Kit (PEK) for homes without a C-Wire and keep your walls looking nice with our trim kit – both sold separately
Change the temperature in the Alexa app
Open the thermostat from the Alexa app’s device list to use its available controls. With Amazon Smart Thermostat, a manual change can override the schedule temporarily, until the next scheduled change. Amazon’s instructions are in Adjust Your Home Temperature Manually.
Set a temperature with a routine
In the Alexa app, create or edit a routine and add a Smart Home action for the thermostat. Amazon’s routine controls include setting a temperature or turning on fan mode. See Set Your Home Temperature with a Routine for the routine setup flow.
Rank #4
- Like-New Amazon Smart Thermostat is refurbished, tested, and certified to look and work like new and comes with the same limited warranty as a new device. Like-New Amazon devices may be packaged in generic Amazon-branded boxes.
- Smart upgrade - Amazon Smart Thermostat is an easy way to switch from a traditional thermostat and help reduce energy usage.
- Create comfort zones throughout your home by using select Echo devices or Amazon Smart Air Quality Monitor to automatically adjust heating and cooling based on temperature readings or presence detection.
- Save money - After purchase, Amazon will send you an email with details about rebates that may be available from energy providers in your area. Explore rebates above.
- Save energy - According to EPA estimates, ENERGY STAR certified thermostats save an average of $50 on yearly energy bills.
Configure Automatic Control on Amazon Smart Thermostat
Amazon Smart Thermostat also offers Automatic Control settings for sleep and away temperatures. Configure them in the thermostat’s device settings in the Alexa app. Details are in Control Your Home Temperature with Alexa Automatic Control.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsUse supported Echo devices as temperature sensors
For Amazon Smart Thermostat, Amazon lists Echo (4th Generation), Echo Dot (5th Generation), Echo Dot with Clock (5th Generation), and Amazon Smart Air Quality Monitor as supported external temperature-sensing devices. The thermostat supports up to 10 external temperature sensors. When you select more than one Echo device, Alexa uses the average of their temperature readings. Amazon also allows sensor selection for schedules and Automatic Control. Follow Set Up External Temperature Sensors with Amazon Smart Thermostat to configure them.
Best Value
- Echo Hub — An easy-to-use smart home control panel redesigned for your home. Arrange controls on your dashboard to quickly adjust devices, view cameras, start routines, and more.
- Customize your dashboard — Arrange devices into sections and resize them to focus on what matters most. Create a personalized layout that matches how your family uses their connected devices.
- Reimagined for your home - With an Alexa+ and compatible Ring subscription (sold separately), get Ring camera event summaries to stay in the know. Search your Ring footage using simple voice commands. Create routines by voice, activate modes to manage multiple devices at once, and chat with Alexa to easily control your smart home.
- Home security for the whole family — Use Echo Hub to easily arm and disarm your compatible security system, making it easy for everyone in your family to manage home security. Use the Alexa app and compatible cameras, locks, alarms, and sensors to check in while you're out.
- Works with thousands of Alexa compatible devices — WiFi, Bluetooth, Zigbee, Matter, Sidewalk, and Thread devices sync seamlessly with the built-in smart home hub.
Troubleshoot connection and installation problems
Alexa cannot find or connect to the thermostat
- Check Wi-Fi. Amazon Smart Thermostat requires 2.4 GHz Wi-Fi; 5 GHz is incompatible. Amazon’s troubleshooting guidance also says to turn off the router’s WPA3 setting.
- Check compatibility and power. Confirm the HVAC system is supported and that HVAC power is on when required for setup.
- Restart the setup flow. Use the Alexa app to restart or reinstall the device where appropriate.
See Amazon Smart Thermostat Installation Isn’t Working for the official troubleshooting steps.
The thermostat powers on but installation fails
Check that wires are in the correct terminals, the R jumper position matches the number of R wires, and the C-wire is connected at the HVAC control board. If the thermostat displays “SEt” with a blinking yellow light, Amazon says it may be installing updates. Avoid changing wiring unless HVAC power is off and you are confident in the work.
Quick Recap
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