In order to power most of our Honeywell Wi-Fi smart thermostats, your system must contain a C-wire.
There is an exception, specifically if you have the Lyric Round Wi-Fi Thermostat. That can be used without a C-wire in most instances. However, if you plan to link the Lyric Round to an Apple HomeKit hub, have forced air zone panel or a Taco zone value, the C-wire is required.
Use the chart below to confirm that your system meets the compatibility requirements. This chart will determine compatibility with most systems, but as wiring systems vary from home to home, there may be some exceptions. To learn more about the C-wire, please view our "What is a C-Wire" FAQ Article.
Congratulations, this thermostat will work with your system.
Watch the video called:
"Substitute extra wire for C-wire"
"Substitute G-Wire for C-wire"
Sorry, this Wi-Fi thermostat won't
work with your system. Click here for other thermostat options.
To help you know for sure if your system will work with the Wi-Fi thermostat, please send us a picture of your current thermostat wiring.
Honeywell Customer Care Hours:
Monday – Friday from 8:00 AM – 7:00 PM CST/CDT
Saturday from 8:00 AM - 6:00 PM CST/CDT
Sunday from 9:00 AM – 6:00 PM CST/CDT