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Old 08-02-2007, 12:08 PM   #1
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I have searched this topic with no luck in finding a discussion I recall on this general subject. My recollection is that the advice is that the temp difference between the ceiling duct and thermostat should be about 20 degrees F. Does this difference apply to the return air duct under the bed as well? I would guess the temp at the thermostat is a little cooler than at the return duct but have not meassured. I made a quick measurement the other day in 93 degree outside temp and had about 25 degree difference between ceiling duct and thermostat. I probably didn't let it run long enough to get true readings.
Basement air/ducted ceiling. Under bed return air.
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Old 08-02-2007, 12:08 PM   #2
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I have searched this topic with no luck in finding a discussion I recall on this general subject. My recollection is that the advice is that the temp difference between the ceiling duct and thermostat should be about 20 degrees F. Does this difference apply to the return air duct under the bed as well? I would guess the temp at the thermostat is a little cooler than at the return duct but have not meassured. I made a quick measurement the other day in 93 degree outside temp and had about 25 degree difference between ceiling duct and thermostat. I probably didn't let it run long enough to get true readings.
Basement air/ducted ceiling. Under bed return air.
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Old 08-02-2007, 03:41 PM   #3
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The temperature of the air leaving the discharge ducts should be 20 degrees F lower then the air returning through the return air grill.
In other words there should be at least a 20 degree drop across the evaporator coil of the Air conditioner.
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Old 08-02-2007, 05:05 PM   #4
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Normally you would run the unit fro at least 10 or 15 minutes. Set the T'stat down to keep the unit running. You should get 18 to 20 dF difference across the evaporator (temp in - temp out). More or less than this, the unit is not performing up to standards.

You should measure the temp in and out as close to the evaporator as possible.

Ken
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