I have a 40 yr. old Thatcher gas furnace that is very loud everytime it comes on to heat the house. It's loud enough that it wakes me up on the 2nd flr when noise rumbles through the forced air vents. I'm not in a position to replace it this winter. My ques. is how inefficient would it be to just keep the "fan on" at night on cold evenings with thermostat set at let's say 65 degrees vs. have it on "auto" where it recycles every half-hour or so? Is there a big difference with the thermostat set on auto vs. fan "on"? Thanks for any opinions on this....
it's not a gas explosion just a very old but still working furnace. the noise is just the motor (belts) kicking in. sort of sounds like a 757 airbus starting up....
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