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On Thu, 28 Jul 2005 11:55:44 -0400, Slumlord
wrote:

An A/C system should be sized for the design point in your area. If
it was sized for the max temp (100F+), the system would be
oversized,
causing a humidity problem in your home during evenings and cooler
days.

A-ha! That's why it is common to see window boxes installed in homes
along with properly sized central air, in places like Los Angeles.
An extra 8000 BTU/hr can really help out in a kitchen during a heat
wave. A 5000 BTU/hr unit can help in the bedroom of a house full of
children, when the parents want to keep the door sealed for privacy.
And there are other situations...

But I disagree about oversizing, to a point. 20 or 25% oversize
isn't going to hurt that much, with a well designed package and a
variable or multi speed blower. The better systems can be made to
unload quite nicely on milder days, without excessive short cycling.
There will be a very slight loss of efficiency, if any. But a
too-small system can't perform any magic.

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--
-john
wide-open at throttle dot info