Do I need a C-wire to install the Amazon Smart Thermostat?
Yes, the Amazon Smart Thermostat requires a C-wire or a power adapter kit. You should use the compatibility checker before purchasing to see if your home has a C-wire already. If there is no C-wire or unused wire behind the wall plate, a C-Wire Adapter is required.
From the official Amazon Smart Thermostat manual, page 2
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