re: Replacing entire AC system

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Probably a dumb idea. Tonnage shouldn't be based only on square footage, but that is a lot of tonnage for such a small area. Oversized is just as bad as undersized.

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Even with the rough guides, I'd still say it depends. I had a 4 ton R22 unit for my house, which is about 1900 square feet. It just wasn't keeping up worth a damn in the summer, even with a replaced evap coil and full freon charge. I have 11 large windows facing the west side of the house (with blinds and solar screens), and I could not get the house below ~78 between noon and almost 10 at night during the summer. We ended up going to a 5 ton unit on the recommendation of an HVAC engineer, and things are back to normal in the house in the summer now. The electricity bill went down by about $60/month as well.