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Re: OT: Central AC Question
Posted by AeroLady (more from AeroLady) on Sun, 6 Jun 2010 07:20:35
In Reply to: OT: Central AC Question, SS, Sat, 5 Jun 2010 21:34:49
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There are several factors, including climate, age and efficiency of the units, and whether you are referring to efficiency strictly as cooling capacity, or as electrical usage. If you live in a humid climate the basement probably needs to be dehumidified, and the basement a/c unit will do that but it will not efficiently assist in cooling the upstairs because cold air falls.
We have a two story house, with two zones of central a/c and an open stairway. The upstairs zone cools the entire house about 95% of the time because the cool air falls. The downstairs zone only comes on when the outside temp reaches above 90. In the winter it is the opposite, the downstairs heat rises so the downstairs zone heats most of the house unless it is very cold. And then we have an energy efficient dehumidifier in the unfinished basement during the summer, and that really sucks the electricity.
Central a/c units are usually designed to run most efficiently near max capacity. Since your basement is presumably mostly underground, it probably does not require as much a/c. I would let the central unit run as much as it can, and use the basement unit as a supplement/dehumidifier as needed.
Another consideration is the use of an attic fan, one that is mounted in the roof (vs. a whole house fan in the ceiling). This in itself will significantly reduce the load on the a/c by lowering the temp in the attic.
AeroLady
'02 Aero SW, 5sp., 95K, Saab #3
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