Quote:
Originally Posted by rbp
Oddly enough I am an expert.
First off (if done right) the AC system needs to be sized to maintain a 12 - 15 deg. F difference between the outside and inside
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This is the dumbest thing I have ever heard.
In your heat calc you specify what your design outdoor temp is along with what the desired indoor temp is. At my place in MN, I figured OA design of 90 and indoor desired of 70. On those "design" days my ac will not shut off providing perfect, dry indoor conditions.
Oh, and your delta from SA to RA should be right around 20°f for comfort cooling.
To the OP, you definetly don't want to be oversized in cooling capacity so be sure to calc the heat load for whatever insulation you do install, not what the mechanical contractor thinks is going to be there.