In my opinion, you should definitely replace the entire system, including the inside supply fan unit, instead of replacing a coil. Get three estimates. And, don't spend extra money on an SEER rating that is higher than the mandatory rating. The new mandated SEER ratings are probably higher than the unit that you are replacing. Basically, the new outside condenser unit will be larger than the one you have, which makes it more efficient. I think Sun Kool is a good company, and also Chuck Farrell and Munn's.
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