A/C runs constantly


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Old 08-19-14, 04:22 AM
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A/C runs constantly

So, just moved to North Carolina, and this first week here has been in the 90's and humid! We live in a double wide, set the thermostat to 70 degrees,and through out the day the temp will climb up to 78 degrees, and the compressor runs all day! When i touch the low pressure line at the Evaporator Coil, it's barely cold, and the high pressure line isn't very hot, i thought the low was supposed to be really cold, and the high hot?? Is this normal? Im really concerned about the electric bill going sky high, and 78 is pretty warm in the house! Thanks for any help or advice!
 
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Old 08-19-14, 04:50 AM
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You're correct, the low pressure line should be very cold to the touch and the high pressure line should be hot. It sounds like you're A/C isn't running very efficiently. Measure the Delta T (difference in temperature between the air temp at the return and the air coming out of a duct near the air handler). This gives you an indication of how much cooling you're actually getting. The Delta T should be somewhere in the 15-20 degree range.
 
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Old 08-19-14, 08:20 AM
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Get a humidity gage at a hardware store for indoor humidity.
At around 50% RH the temp-drop should be around 19 to 21F.

Also, check the temp of the air coming off the outdoor condenser compared to the outdoor temp.
This will provide an indication of how well it's performing.

Perhaps the duct system is not delivering the air to & from the rooms as it should.
Is the airflow low?

The high pressure small pipe should not be hot on new high-SEER systems; it can be mildly warm though.

The temps of the lines should be checked for superheat & subcooling readings.
How old is the unit & what SEER is it?
 
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Old 08-21-14, 04:28 AM
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Thanks

Thanks for the replies! The seer is 13, its a 3ton system, up flow/down flow system. Its a Goodman model# CAPF3636B6BA, if that helps? As far as air flow from the vents, some are great, some not so much! Being claustrophobic, I'm a little weary getting underneath to check all the venting! What do you think a hvac company would charge to get under there,inspect and fix if needed? Would it be worth $80 to have a company come out and check it over? Thanks again!
 
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Old 08-21-14, 06:32 AM
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You need to call a tech to check the refrigerant level, sounds a little low and there may be a small leak.
 
 

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