The thermostat requires a C wire for power, and for those without one, Meross offers a C Wire Adapter, which can be purchased ...

List prices start at $80 for a smart thermostat without a C-wire (or, common-wire) power adapter kit. You may need a C-wire adapter to properly hook up your smart thermostat -- or you may not ...

If you aren’t sure ifr you have a C-wire, consult an HVAC technician. If you know you don’t have a C-wire but you really want a smart thermostat, you have a few options: ...