From: Jim
Newsgroups: misc.consumers.house
Subject: Re: Is my A/C system too small?
Date: Sat, 12 Jun 2004 23:34:00 -0500
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On Sun, 13 Jun 2004 00:05:40 GMT, tallen16@sbcglobal.net wrote:

>I have a brand new house approx 2000 sq feet the home builder had a 3
>1/2 ton carrier weathermate system installed.I live in houston high
>humidty and gets pretty hot here.During the winter the system seemed
>to heat good enough,but now that summer is here its cooling is
>terrible.During the day if we set it too 75 once it gets past noon the
>unit never shuts off so we have to raise to 78 or 79 and its not even
>really hot outside its 90 or so.We have had the a/c contractor out
>several times for other problems and monday their coming out once
>again to check the system.I dont think the unit is big enough i know
>you cant really use the rule of thumb method but everything ive read
>says we need more along the lines of a 4 ton unit.One other thing the
>builder told us to keep the humidity setting at 70 but according to
>the ASHRAE faq it should be between 30 to 60% any thoughts or
>suggestions would be really appreciated.
>
>
>Thanks 
>
>David


Might want to read this URLs for some help to your question.

http://www.construction-resource.com/forum/ftopic538.html
http://ths.gardenweb.com/forums/load/hvac/msg0423244811648.html

You can also do a google search on sizing a/c but to do it right you
need an HVAC guy come see your home and estimate tonage required.
This method may not be free.