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Posted by Astro on August 3, 2006, 9:06 am
beth wrote:
> HI. I recently did a major overhaul on our house in Atlanta, due to a
> fire last summer. My house is about 2500 sq.ft. and the sub contractor
> put in a 4 ton unit with three zones. We are having a great deal of
> difficulty getting the temperature to be below 78 degrees, especially
> on hotter mid ninety afternoons here. the AC guy says the best you can
> expect is a 20 degree difference on a hot day from the outside
> temperatures. Is that right? We had a 3 ton unit previously that kept
> us at a comfortable 70 (brrr) all year. Oddly enough, the zones
> furthest from the unit keep a cooler temp more consistently. Any
> advice?
> Thx Beth
Something's got to be wrong if your old 3-ton unit was adequate.
I'd have a blower door and load analysis done on the house to see how
the numbers come up. You might also get a thermometer and read the
temperatures going into and coming out of the AC at the closest
register (after it's been running constantly for maybe 1/2 hour) to see
if the differential is in the right ballpark. Did they tell you the
capacity of the air handler in cubic feet/minute? You can have someone
do calculations given the humidity, temperature differential and air
handler cfm's to see if you're roughly getting what you should out of
the system.
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