How Do I Install A Smart Thermostat?

25 minutes read

To install a smart thermostat, begin by ensuring that your HVAC system is compatible with the device. Turn off power to your HVAC system at the circuit breaker to ensure safety during installation. Remove the cover of your existing thermostat and take a picture of the wiring for reference. Carefully disconnect the wires and unmount the old thermostat. Follow the instructions provided with your smart thermostat to mount its base on the wall, ensuring it's level. Connect the wires to the corresponding terminals on the smart thermostat's base, using the photo you took as guidance. Attach the thermostat unit to its base. Restore power to the HVAC system and configure your new thermostat according to the manufacturer's instructions. This usually involves connecting it to your Wi-Fi network and setting up the related smartphone app for remote control. Complete any initial setup prompts, such as choosing your preferred temperature settings and scheduling. If the installation process is too complex or if you're unsure about any steps, consider consulting a professional installer.

Best Smart Thermostats of February 2025

1
ecobee New Smart Thermostat Premium with Smart Sensor and Air Quality Monitor - Programmable Wifi Thermostat - Works with Siri, Alexa, Google Assistant

Rating is 5 out of 5

ecobee New Smart Thermostat Premium with Smart Sensor and Air Quality Monitor - Programmable Wifi Thermostat - Works with Siri, Alexa, Google Assistant

  • Save up to 26% per year on heating and cooling costs. ENERGY STAR certified. Included SmartSensor (50 dollar value) adjusts the temperature in the rooms that matter most to reduce hot or cold spots to keep you comfortable. Compared to a hold of 72°F.
  • Built-in air quality monitor alerts you to poor air quality, provides tips on how to improve it, and reminds you when it’s time to change your furnace’s air filter.
  • Premium materials and advanced engineering mean a large, vibrant display with a cinematic interface, a timeless design, and next level occupancy sensing.
  • Compatible with most 24VAC HVAC systems: furnaces, ACs (2H/2C), heat pumps (2H/2C + 2 stage AUX), boilers, PTACs, and fan coil units (3 fan speeds). Includes Power Extender Kit for C-Wire-less homes, ensuring easy installation.
2
Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Snow

Rating is 4.9 out of 5

Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Snow

  • The Nest Thermostat is designed to work without a C wire in most homes, but for some systems, including heating only, cooling only, zone controlled, and heat pump systems, you’ll need a C wire or other compatible power accessory. Lock feature: No
  • Nest Thermostat turns itself down when you leave, so you don’t waste energy heating or cooling an empty home; easily program an energy efficient schedule in the Google home app on your Android or iPhone
  • Control Nest Thermostat with Google Home and other smart home platforms. Compatible with Google Assistant and all Matter-certified voice assistants. Voice control requires a compatible smart device.
3
ecobee3 Lite Smart Thermostat - Programmable Wifi Thermostat - Works with Siri, Alexa, Google Assistant - Energy Star Certified - DIY Install, Black

Rating is 4.8 out of 5

ecobee3 Lite Smart Thermostat - Programmable Wifi Thermostat - Works with Siri, Alexa, Google Assistant - Energy Star Certified - DIY Install, Black

  • Save up to 23% annually on heating and cooling costs (compared to a hold of 72°F)
  • Control from anywhere using your Android or iOS device
  • Add SmartSensor to manage hot or cold spots and deliver enhanced comfort to the rooms that matter most
  • ecobee was named an ENERGY STAR Partner of the Year award winner
  • Integrates seamlessly with your preferred smart home system. Connectivity - Wi-Fi, 802.11 b/g/n @ 2.4 GHz
4
Amazon Smart Thermostat – Save money and energy - Works with Alexa and Ring - C-wire required

Rating is 4.7 out of 5

Amazon Smart Thermostat – Save money and energy - Works with Alexa and Ring - C-wire required

  • Smart upgrade - Amazon Smart Thermostat is an easy way to switch from a traditional thermostat and help reduce energy usage.
  • 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.
  • Automatic Control - Alexa can automatically switch between your preferred home, away, and sleep temperatures.
  • On-the-go control - Let Alexa set the temperature, or set it yourself from anywhere with the Alexa app.
5
Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, Gray

Rating is 4.6 out of 5

Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, Gray

  • COMFORT COMES IN YOUR COLOR. Personalize your Wi-Fi Smart Color Programmable Thermostat to fit your décor.
  • YOUR SCHEDULE. YOUR WAY. Flexible programming options for your schedule or utility company’s peak rate pricing.
  • EASY OPERATION AND INTUITIVE. Bright, easy-to-read touchscreen makes for simple operation.
  • COMPATIBLE WITH: Forced air (gas, oil or electric), hot water and steam, and heat pumps with electric backup. Does NOT work with electric baseboard heat (120-240V). C-Wire required.
  • ENERGY STAR certified. Help save energy, track your heating and cooling with monthly energy reports and get personalized tips on reducing energy use.
  • Works with most heat/cool oil furnace systems. Will not work with heating only oil furnace systems unless a C-Wire is present.
  • Fan Control Options include On: Fan is always on; Automatic: Fan runs only when the heating or cooling system is on; and Circulate: Fan runs randomly about 35% of the time.
6
Google Nest Learning Thermostat - 3rd Gen (2015) - Programmable Smart Thermostat for Home - Works with Alexa - Stainless Steel

Rating is 4.5 out of 5

Google Nest Learning Thermostat - 3rd Gen (2015) - Programmable Smart Thermostat for Home - Works with Alexa - Stainless Steel

  • Home/Away Assist: don't heat or cool an empty home. Home/Away Assist adjusts the temperature after you leave.
  • Remote control: Control your thermostat from anywhere using the Nest app.
  • Know more, save more Check your Energy History to see how much energy you use and why.
  • Look for the Leaf: The Nest Leaf appears when you choose a temperature that saves energy.
7
Emerson Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, Works with Alexa, Energy Star Certified, C-wire Required, ST75 Black 5.625" x 3.4" x 1.17"

Rating is 4.4 out of 5

Emerson Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, Works with Alexa, Energy Star Certified, C-wire Required, ST75 Black 5.625" x 3.4" x 1.17"

  • PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties
  • SAVE ABOUT 23% ON HVAC ENERGY*: The ENERGY STAR-certified Sensi smart thermostat can help you save energy with features like flexible scheduling, remote access and usage reports
  • SLEEK, MODERN DESIGN: The large color display features easy-to-read temperatures and intuitive menus. Available in black, white and silver to complement your home décor
  • CONTROL FROM ANYWHERE: Remotely control your home comfort from your smartphone or tablet using the Sensi mobile app for Android and iOS devices
8
ecobee New Smart Thermostat Enhanced - Programmable Wifi Thermostat - Works with Siri, Alexa, Google Assistant - Energy Star Certified - Smart Home

Rating is 4.3 out of 5

ecobee New Smart Thermostat Enhanced - Programmable Wifi Thermostat - Works with Siri, Alexa, Google Assistant - Energy Star Certified - Smart Home

  • Save up to 26% per year on heating and cooling costs. ENERGY STAR certified. Automatically adjusts the temperature when you’re away to never heat or cool an empty home. Compared to a hold of 72°F.
  • Enjoy comfort without compromise. Smart Thermostat Enhanced preheats or precools your home before you arrive, so it’s the perfect temperature the moment you walk in. Automatically adjusts to your desired temperature when you’re home or sleeping to keep you comfortable day and night. Adjusts the temperature to account for humidity so your home always feels like the temperature you’ve set.
  • ecobee Smart Thermostat Enhanced is made with quality materials and designed to last on your wall for over a decade. It’s hardwired so you never have to worry about losing control or replacing batteries. If you run into problems, our dedicated support team is available 7 days a week.
  • Add in a SmartSensor which allows you to measure the temperature in rooms that matter most, like the nursery or bedroom. It reads temperature and movement in whatever room it is placed in for complete home monitoring and energy savings (SmartSensor sold separately).
9
Google Nest Thermostat E - Programmable Smart Thermostat for Home - 3rd Generation Nest Thermostat - Works with Alexa,White

Rating is 4.2 out of 5

Google Nest Thermostat E - Programmable Smart Thermostat for Home - 3rd Generation Nest Thermostat - Works with Alexa,White

  • Remote control lets family members change the temperature on this smart thermostat from anywhere using a phone, laptop, or tablet[1]
  • The Nest Leaf appears when you choose a temperature that saves energy; with Energy History, just check your phone to see how much energy you used and find out how to save mo
  • Works with the Nest Temperature Sensor (sold separately) to help make sure a certain room is the exact temperature you want it to be
  • Works with Alexa, Google Assistant, and other smart speakers so you can adjust the temperature with your voice
  • Designed to fit any home, with a frosted display that blends into the background
  • Easy installation, typically in 60 minutes or less, with everything you need included in the box; compatible with 95% of heating and cooling systems


How do I connect a smart thermostat to a smart home hub?

Connecting a smart thermostat to a smart home hub can help centralize your home's automation and create more convenient and efficient control. Here's a general guide to help you connect a smart thermostat to a smart home hub. Note that specific steps can vary depending on the brand and model of both the thermostat and hub:

General Steps:

  1. Check Compatibility: Before starting, ensure that your smart thermostat is compatible with your smart home hub. Refer to user manuals or the manufacturer's website for compatibility lists.
  2. Install the Thermostat: Install the smart thermostat according to the manufacturer's instructions. This usually involves replacing your old thermostat and wiring the new one correctly.
  3. Connect to Wi-Fi: Once installed, power on the thermostat and connect it to your home's Wi-Fi network. This is usually done through the thermostat's touchscreen or companion app.
  4. Install the App: Download and install the app for your smart thermostat on your smartphone or tablet. This app often helps in initial setup and management of the device.
  5. Create an Account: Open the app, create an account, and register your thermostat. This often involves entering a unique device code or scanning a QR code.
  6. Set Up the Smart Home Hub: Ensure your smart home hub is set up and connected to your Wi-Fi network. Follow the hub's setup process if it’s not already configured.
  7. Link the Thermostat to the Hub: Open the app for your smart home hub. Navigate to the section for adding new devices. Look for your specific thermostat model or a generic "thermostat" option. Follow the on-screen instructions to connect the thermostat to the hub. This may involve pressing a button on the thermostat or entering a code from the thermostat’s app into the hub’s app.
  8. Test the Connection: Once the thermostat is added to the hub, test the connection by adjusting the temperature or settings through the hub’s app. Ensure the changes reflect on the thermostat.
  9. Set Up Automations: If your smart home hub supports it, create automation rules to make full use of the thermostat. For example, you can set the temperature to adjust based on your location or time of day.

Tips:

  • Firmware Updates: Ensure both the thermostat and hub have the latest firmware updates for optimal performance and compatibility.
  • Technical Support: If you encounter issues, consult the support sections of the respective brands' websites or forums where other users might have solved similar problems.
  • Voice Assistants: If your hub supports voice control through assistants like Alexa, Google Assistant, or Siri, you may need to link accounts in their respective apps for voice control functionalities.


By following these steps, you should be able to successfully connect and integrate your smart thermostat into your smart home ecosystem.


How do I install a smart thermostat with a heat pump system?

Installing a smart thermostat with a heat pump system can improve energy efficiency and give you greater control over your home's climate. Here's a general guide to get you started, but always refer to the thermostat's manual and consult a professional if needed.

Tools and Materials Needed

  • Screwdriver (typically a Phillips head)
  • Drill (if new holes are needed)
  • Smart thermostat compatible with heat pumps
  • Smartphone or tablet (for setup, if applicable)
  • Labels or tape
  • Voltage tester (optional but recommended for safety)

Steps for Installation

  1. Turn Off Power: Turn off the power to your HVAC system at the circuit breaker. This is crucial for safety to prevent electric shock.
  2. Remove Old Thermostat: Take off the cover of your old thermostat. Unscrew and remove the base plate, noting the wires connected to each terminal. Label the Wires: As you disconnect each wire, label them according to the terminals they were connected to (e.g., R, G, Y, W, etc.).
  3. Verify Compatibility: Check that the smart thermostat is compatible with heat pump systems. Most smart thermostats are, but it’s good to confirm in the manual.
  4. Install the New Base Plate: Thread the wires through the base plate of the new thermostat. Use a drill to mount the base plate to the wall. Make sure it's level.
  5. Connect the Wires: Attach the labeled wires to the corresponding terminals on the new thermostat base. Ensure all connections are secure and follow the diagram provided in your thermostat’s manual. Typical heat pump wiring includes terminals like R (power), C (common), Y (compressor), O/B (reversing valve), G (fan), and Aux/E (auxiliary or emergency heat).
  6. Attach Faceplate: Snap the new thermostat onto the base plate.
  7. Power On and Set Up: Restore power to the HVAC system at the circuit breaker. Follow the instructions on the thermostat’s screen for initial setup. This may involve connecting to a Wi-Fi network and setting preferences via a smartphone app.
  8. Configure Thermostat Settings: Specify you have a heat pump during setup. Set your desired temperature schedules and any specific energy-saving features the smart thermostat offers.
  9. Test the System: Ensure the system is heating and cooling as expected. Test all modes (heat, cool, fan) to verify correct operation.
  10. Additional Configuration:
  • Configure more advanced settings through the app, like geofencing, scheduling, and energy reports.

Important Considerations

  • Professional Help: If you’re unsure about any part of the process, consider hiring a professional technician for installation.
  • Wiring Verification: Some older systems might not have a common wire (C-wire), which is required by most smart thermostats. You may need a C-wire adapter or professional assistance to install one.
  • Safety: Always ensure power is off when handling wiring and use caution to prevent mistakes that could damage the thermostat or HVAC system.


Following these steps should help you successfully install a smart thermostat with a heat pump system.


What is the process for updating the firmware on a smart thermostat?

Updating the firmware on a smart thermostat generally involves the following steps. However, please refer to the specific instructions for your thermostat model, as the process can vary slightly between different brands and models:

  1. Check for Updates: Access the thermostat’s mobile app or web portal. Navigate to the settings menu and look for a section related to firmware updates or software updates.
  2. Prepare Your System: Ensure the thermostat is connected to a stable Wi-Fi network. A strong internet connection is often necessary for downloading and installing updates. Make sure the thermostat is powered and that the batteries are fresh if it uses batteries.
  3. Initiate the Update: If an update is available, you might see a prompt either on the thermostat’s interface or within the app. Follow the instructions to begin the update process. This usually involves pressing a button to confirm the update on either the device or within the app.
  4. Installation: The thermostat will typically download and install the update automatically. This process might take several minutes. Do not turn off the power or disconnect the device from Wi-Fi during the update.
  5. Reboot: After the update is complete, the thermostat may automatically restart. Allow it to reboot fully before attempting to control it again.
  6. Verify the Update: Once the update is complete, verify that the firmware version has been updated in the settings menu. Check that the thermostat operates as expected and all settings have been retained.
  7. Troubleshooting: If you encounter issues during the update, refer to the support section of your thermostat’s user manual or contact customer support for assistance.


Always refer to the user manual or the manufacturer’s website for specific instructions related to your particular model of thermostat.


How do I troubleshoot connectivity issues with my smart thermostat?

Troubleshooting connectivity issues with your smart thermostat can help restore its functionality and ensure it efficiently controls your home's heating and cooling system. Here's a step-by-step guide to help diagnose and resolve these issues:

  1. Check Power Supply: Ensure the thermostat is receiving power. Check the circuit breaker for any tripped switches. For battery-operated models, replace or recharge the batteries.
  2. Verify Wi-Fi Connection: Confirm that your Wi-Fi network is working for other devices. Ensure the thermostat is within range of the Wi-Fi router. If necessary, consider moving the router or using a range extender.
  3. Reboot the Thermostat: Restart the thermostat following the manufacturer's instructions, often by pressing a reset button or removing and reinserting batteries.
  4. Reconnect to Wi-Fi: Go to the thermostat's settings menu and reconnect to your Wi-Fi network. Ensure you enter the correct password.
  5. Update the Firmware: Check if there is a firmware update available for your thermostat. Updating can resolve compatibility and connectivity issues.
  6. Verify Router Settings: Make sure your router’s firmware is up to date. Ensure that the correct network settings (such as 2.4GHz vs. 5GHz) are compatible with your thermostat. Check whether MAC address filtering is enabled and add your thermostat’s MAC address if necessary.
  7. Check Network Congestion: Too many devices connected to your network can cause connectivity issues. Disconnect some devices if needed.
  8. Examine Thermostat's App: Make sure the app on your smartphone is up to date. Log out and back into the app to refresh the connection.
  9. Factory Reset: As a last resort, perform a factory reset on the thermostat. Follow the manufacturer-specific instructions for this process.
  10. Check for Interference: Other electronic devices or thick walls can cause interference. Try relocating these items or the thermostat itself.
  11. Contact Support: If the issue persists, contact the manufacturer's customer support for further assistance.


Following these steps should help you resolve most connectivity issues with your smart thermostat. If problems continue, the issue may require professional evaluation or replacement of the device.


How do I lock or unlock my smart thermostat to prevent tampering?

Locking or unlocking your smart thermostat to prevent tampering can vary depending on the brand and model you have. However, here are some general steps for popular smart thermostats:

Nest Thermostat

  1. Locking: Open the Nest app on your smartphone or go to the thermostat. Go to "Settings" and select "Lock." You’ll be prompted to set a PIN. This PIN will be required to change the temperature outside of the set range. Confirm the temperature range that you allow (outside of this range, a PIN will be needed).
  2. Unlocking: On the thermostat, select the option to unlock. Enter the PIN you set to unlock the thermostat.

Ecobee Thermostat

  1. Locking: Go to the main menu on your thermostat or the Ecobee app. Navigate to “Settings,” then “Access Control.” Enable the “Screen Lock” option. Set up a 4-digit PIN to lock the thermostat’s settings or controls.
  2. Unlocking: Tap the screen or go to the app, and it will prompt you to enter the PIN. Enter the 4-digit PIN you set to unlock the thermostat.

Honeywell Thermostat (e.g., T6 Pro Smart)

  1. Locking: Press “Menu” on the thermostat. Use the arrow keys to navigate to “Lock” or “Screen Lock.” Choose the level of locking: “Partially Locked” (limited control) or “Fully Locked” (no control without PIN). Enter a 4-digit PIN when prompted.
  2. Unlocking: Press the lock symbol or attempt an input to prompt the unlock screen. Enter your 4-digit PIN to unlock.

General Tips:

  • Consult the Manual: Always refer to your thermostat’s user manual for specific instructions and capabilities.
  • App Usage: Most smart thermostats allow for locking through their respective apps, which might provide more flexibility or options.
  • Remember or Note Your PIN: Forgetting your PIN can be troublesome as it may require a factory reset or contacting customer support.


If you continue to have issues or difficulties, it might be helpful to consult the customer support of your smart thermostat’s brand for assistance.


How do I control a smart thermostat using my smartphone?

To control a smart thermostat using your smartphone, you generally need to follow these steps:

  1. Choose a Compatible Smart Thermostat: Ensure that the smart thermostat you have is compatible with your smartphone and your home Wi-Fi network.
  2. Download the App: Go to the App Store (iOS) or Google Play Store (Android) and download the app specific to your thermostat’s brand (e.g., Nest, Ecobee, Honeywell Home).
  3. Install the Thermostat: If you haven’t installed the thermostat yet, follow the manufacturer’s instructions for installation. This might include wiring, mounting, and connecting it to your Wi-Fi network.
  4. Create an Account: Open the app and create an account if you haven’t already. You’ll typically need to provide some basic information like your email address and password.
  5. Connect Your Thermostat to Wi-Fi: Access the thermostat’s settings either through the device itself or the app. Follow the prompts to connect the thermostat to your home’s Wi-Fi network.
  6. Pair Your Smartphone with the Thermostat: Open the app and log in with your credentials. Follow the instructions to add a new device or connect your thermostat. This often involves scanning a QR code on the thermostat or entering a setup code.
  7. Set Preferences and Schedules: Use the app to set your temperature preferences, create heating/cooling schedules, and adjust settings. Most apps offer an intuitive interface for customizing these options.
  8. Remote Control: Through the app, you can adjust the temperature, switch between heating and cooling modes, and monitor energy usage from anywhere, as long as your smartphone is connected to the internet.
  9. Integration with Smart Home Systems: If desired, integrate your thermostat with other smart home products, such as Amazon Alexa, Google Assistant, or Apple HomeKit, for voice control and automation.
  10. Troubleshooting: Refer to the app’s help section or the manufacturer’s website if you encounter any issues. Ensure both your smartphone and thermostat have the latest software updates for optimal performance.


By following these steps, you can manage your home’s climate easily and efficiently from your smartphone.

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