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View Full Version : Thermostat- only 4 wires

saram1978
Jul 10, 2008, 11:21 AM
I would like to know how to put in a new thermostat for an older house that only has 4 wires.
Stratmando
Jul 10, 2008, 02:31 PM
What colors?
1 is from transformer
1 is for blower control
1 is for compressor control
1 is for heat .