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Old thermostat has 6 wires
I would like to install a new programmable thermostat. I have natural gas heat with electric air. The old thermostat has the following wires w1,w2,y1,g1,r, and b. There are 28 v running between r and b. Can I install a new prgrammable 5 wire thermostat? If so, which wires go where? What do I do with the extra wire? Thanx
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