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Frequently Asked Questions

How many wires for thermostat?

Generally speaking, a thermostat that controls only heat in your home will have two wires, and one that also controls air conditioning must have at least three or four wires. If your system also includes ventilation or a heat pump, the thermostat can have as many as seven wires.

How do you connect a thermostat to a furnace?

Most thermostat systems have two wires. One is red, the other is white. Strip the casing ¼ inches from both ends of both wires. Install the white wire on the thermostat and the furnace terminals that say "W.". Connect the red wire to the thermostat and the furnace at the terminals that are marked "R.".

How does thermostat wiring work?

Thermostat wiring consists of wires that connect the transformer to the system relays. When you move the lever on the thermostat to turn up the heat, this rotates the thermometer coil and mercury switch, tipping them to the left.

What is the Black Wire on a thermostat?

The Black wire on the heat strip is usually the 2nd stage of electric heat or sometimes called “Emergency” heat and would attach to the W2 or E terminal on the thermostat. Green on the heat strip unit normally is the fan relay wire on the air handler and would attach to the G terminal on the thermostat.


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