“I have an old oil burner and central AC, NO heat pump, and my old thermostat has a manual mechanical heat/cool mode switch. That old thermostat had separate B and O wires. I don't think I need them now with the Nest Learner am I right?”
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The guide to install the NEST is simple it will tell you step by step if you need it or don’t if you do it will show you where to plug it
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