Question:

Why is the furnace blowing cold air if the thermostat is on heat setting, set to 80 degrees, and I changed out filter?

Answer:

There could be several reasons such as a bad regulator or the fire may not be on in the furnace. Perhaps have it serviced. AnswerParty!


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thermostat
Temperature control
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Fireplaces
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Furnace
Heating, ventilating, and air conditioning
Programmable thermostat
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