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Old 07-10-2011, 04:11 PM   #1
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Ac wont keep house cool


My downstairs AC won't maintain the set temp. The upstairs is cold and separated by bedrooms. Downstairs is fairly open. It blows cold air from the ducts. Checked duct connections all is fine. Felt supply lines and they feel fine. Washed off fins. Live in las vegas where humidity is usually around 13% this past week has been stormy with humidity at about 60-65%. Any suggestions would be helpful. Unit is a lennox

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Old 07-10-2011, 04:46 PM   #2
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Ac wont keep house cool


What is the temperature split between the cold supply air temp and room temp ?

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Old 07-10-2011, 04:58 PM   #3
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Ac wont keep house cool


I have the thermostat set for 78. The inside temp ranges between 80-81. during the day. at night it maintains the 78 setting
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Old 07-10-2011, 05:00 PM   #4
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Ac wont keep house cool


Doesnt sound like a big deal but it means the unit is constantly on and running
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Old 07-10-2011, 06:40 PM   #5
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Ac wont keep house cool


What is the cold air temperature that blow into the room from the register ?
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Old 07-10-2011, 07:04 PM   #6
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Ac wont keep house cool


How would I check that?
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Old 07-10-2011, 07:10 PM   #7
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Ac wont keep house cool


Quote:
Originally Posted by kmkiley View Post
How would I check that?
Go to the store and get a thermometer that goes below 0 degrees. Find them in the kitchen section at Bed, Bath & Beyond, Target, Wal-mart. Hold the probe end in the closes vent to the air handler, and then go to the farthest one. Mine runs around 44-48 degrees. My home stays around 72 during the day, 70 at night. 78 is way too warm for me, no matter where it would be.

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Old 07-10-2011, 08:46 PM   #8
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Ac wont keep house cool


If you don't have the type of thermo mentioned by gregzoll, any thermometer will do, just put it within one inch of the cold air register and measure the air temp. I bet your air temp is somewhere between 60 and 80...( all we want to know is exactly how cold the air is)

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Last edited by clocert; 07-10-2011 at 08:48 PM.
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