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What do I do if I only have 2 wires?
Is my gas furnace compatible?
My thermostat won't register
My device won't turn on: Powering the Simple Thermostat
C-Wire Adapter Module - Installation Guide
Fast-Stat 1000 and Common Maker - Installation Guide
How to use a 24-Volt Power Adapter to Power your Simple Thermostat
What is a C-wire?
I don't have a C-Wire