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Old 05-22-2012, 09:36 AM   #1
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return air metal duct

i just had a/c house. the installer stated that my return
air duct did not need to be insulted..basement is not finished.
only ran a/c for 6 hrs.the basement was colder than ever!!!
TRANE company stated that this is up to the installer...
should the return duct be wraped like the feed duct???
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Old 05-22-2012, 10:08 AM   #2
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Yes. What can happen is the air which is being pulled from the living space can change temperature on it's way back to the furnace, usually gaining temperature especially if the ducts are in an attic. Increase in return air temperature results in increase in supply air temperature resulting in not as cold air resulting in possible longer run times resulting in higher eletcric bills.

If the furnace is in a conditioned space such as in the basement and that's where the return line is then it wouldn't be much of a worry.
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Old 05-22-2012, 10:36 PM   #3
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Not required inside a conditioned space.

Make sure all the seams in the ductwork are sealed up tight. That could be a bigger part of the problem.
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