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Mechanical or electrical device used to control a heating, ventilation, and air conditioning (HVAC) system, or other temperature reliant system.

2 votes
2 answers
168 views

C wire - Where does it go?

Got a wifi thermostat. Behind the old thermostat was a blue wire. The other side of the blue wire in the equipment isn't plugged into anything. …
user3330299's user avatar
2 votes
2 answers
6k views

"C" wire in wall! Where does it go in air handler/furnace?

Got a wifi thermostat. Behind the old thermostat was a blue "C" wire. The other side of the blue wire in the equipment room isn't plugged into anything. …
user3330299's user avatar