Thermostat Bunk? Set At 78 AC Still Running At 73 - HVAC - DIY Chatroom Home Improvement Forum


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Old 07-02-2011, 09:29 PM   #1
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Thermostat bunk? Set at 78 AC still running at 73


Is my thermostat bunk? I have it set at 78 and AC still running even though the temp is 73 inside now. If it turn the thermostat up to 80 it does top though.

Any ideas?

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Old 07-02-2011, 10:31 PM   #2
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Thermostat bunk? Set at 78 AC still running at 73


Sounds like either old thermostat way out of calibration or it is installed on a outside wall or it is being effected by a heat source like a bulb, toaster etc...

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Old 07-03-2011, 02:17 PM   #3
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Thermostat bunk? Set at 78 AC still running at 73


I just changed out my thermostat this a.m. as it was doing the same thing. It was an old mercury filled one.
I have my new one set at 79 and so far it kicks off at 79.
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