Best smart thermostats that don't require a C wire 2022

If you're going from an older thermostat to a new smart one, you may find that your system is without a C wire. If that's the case, you can install one, pay to install one, or simply grab one of these smart thermostats that don't even need one.

source https://www.androidcentral.com/these-smart-thermostats-dont-require-c-wire