What Is C-Wire on a Carrier Thermostat? (You NEED to Know This!)

If you have a thermostat, you probably hear the word c-wire a lot. You probably already know all the components of your smart thermostat, and a c-wire isn’t one of them. So what is a c-wire on a thermostat? And do all thermostats need a c-wire?  A c-wire is a cable connecting your heating system …

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