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Posted by JT on July 27th, 1998 09:21 PM
In reply to Moisture on ceiling by Bruce M on July 26th, 1998 09:04 AM [Go to top of thread]

Bruce makes some good points. First, try to idententiby
any sources of excess moisture. Do you have a damp
crawlspace thanks to El Nino? If there isn't any excess
moisture source, there are a couple of possiblities
related to the AC. First, it may be oversized. The
amount of water it can remove is related to how long
it runs, and an over sized unit will run in short
bursts; the house gets cool, but moisture remains.
Another possibility is duct leakage. If the
return ducts run through unconditioned areas (as they
usually do) and leak, they will suck warm humid air
in not only reducing efficiency, but leaving more
moisture in the air, not to mention driving moist
air into the walls and ceilings (very bad for the
house). If there a supply duct leaks,
they will tend to depressurize the house and suck
outside air in through various cracks and crevices.
To quantitativly assess duct leakage you need someone
with the right tools i.e. a Duct Blaster, but you can
get some idea of what the situation is by doing
a "front door test". Rather than describe it here,
go over to Lastly, you may
want to consider dual closeable returns for the room, one
high and one low. Use the high one in cooling season,
and the low one in heating season. Some food for
though anyway.

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