What Thermostats Work With Carrier? (2026)
Updated: Nov 4
Short answer: if your Carrier system uses conventional wiring (R, Y, G, W, O/B and C), most smart thermostats will work with it. If you have a Carrier Infinity communicating system wired to A, B, C and D terminals, you'll need a Carrier Infinity control to keep all its features.
Check your wiring first
Safety first: thermostat wiring is low-voltage (24V), but I always cut power to the HVAC system at the furnace switch or the breaker before I pull the thermostat off the wall.
With the power off, take the thermostat off its base and look at the terminal labels:
Conventional wiring: letters like R, Y, G, W, O/B and C. Sensi, Nest and ecobee can all handle this.
Infinity communicating wiring: usually just four wires on terminals labeled A, B, C and D. That's Carrier's communicating setup, and a regular smart thermostat won't control it the same way.
Snap a photo of the wiring before you disconnect anything. It makes the install, or a call to a tech, a lot easier.
Comparison: thermostats for Carrier systems
Thermostat | Best for | Skip it if |
Carrier Infinity Touch | Carrier Infinity communicating (ABCD) systems | You have a conventional system and want more brand choices |
Sensi Touch 2 | Most conventional Carrier systems, simple app, optional room sensors | You don't have a C-wire and don't want to add one |
Google Nest | Google Home households who like a learning thermostat | You have an Infinity communicating system |
ecobee | People who want room sensors and voice control | You want the simplest possible setup |
Carrier Infinity Touch
This is Carrier's own control for Infinity systems. If your system is wired A-B-C-D, keep the Infinity Touch (or another Carrier Infinity control). It's the only way to get the full features the system was designed for.
Sensi Touch 2
This is my personal favorite. It works with almost all conventional Carrier systems, the app is easy, and it works with optional Sensi room sensors if you have rooms that run hot or cold. It needs a C-wire.
Google Nest
The Nest works with conventional Carrier systems. It's a good fit if you already use Google Home and want a thermostat that learns your schedule. Skip it on an Infinity communicating system.
ecobee
ecobee works with conventional Carrier systems and supports room sensors, which helps in two-story houses. Skip it if you want the most basic setup or have an Infinity system.
Not sure what you have?
If the labels don't match either list, or you just aren't sure, call an HVAC tech. A quick visit beats guessing and damaging a control board.
My pick
For a conventional Carrier system, I'd go with the Sensi Touch 2. For a Carrier Infinity system, I'd keep the Carrier Infinity Touch.
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