Our Trane furnace is 9.5 years old. Thermostat is set at 70, but house temp. registers at most 67 and usually up to 6 degrees less. Could it be just that the return filter needs cleaning or perhaps coils need cleaning or would you suspect something worse?

Asked by Richard Williams on 12/04/2011 0  Answer

ManualsOnline posted an answer 12 years, 10 months ago

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