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Ac unit ran for 4 hours and the temperature reading on thermostat stayed the same so it wasnt registering the temperature in house is it a faulty thermostat

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Get a thermometer and check it against the thermostat
This should give your answer
If this was helpful please rate me.
Leo Ponder Appliance-Tyler,Texas
imufo2@sbcglobal.net

Posted on Aug 06, 2010

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You are still low on freon. Charging AC by superheat and subcool
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Hook up your gages and put a thermometer on suction line (large line), start the AC. Measure the temperature of the suction line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant, (you can also use a temperature pressure chart), now read the thermometer, let’s say the suction temperature( the thermometer) is 67° and the saturation temperature (the gages or temp. press. Chart), is 55°, subtract the saturation temperature from the suction temperature, 67°- 55° = 12° superheat.
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