Upgrading central AC unit before adding onto house -- caveats?
As for the 4 ton for 2100 square feet, it's my understanding that 1 ton
is suggested per 500 square feet, so 4 tons for 2000 square feet. Is
this not correct?
This is a perfect example of a really, really bad way to size an A/C. Your
contractor should have done Manual J and Manual D calculations which take into
account things like insulation, windows, building orientation and duct size.
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