Sizing a Minisplit for a Terribly Built Condo
A client is considering a mini split for her zone 5b, 1600sf, 3 room condo. It was built in the early seventies, and built badly. This particular condo is ground floor, an end unit, one story, three walls are exterior. The roof is 2×12 rafters, walls are 2×6 on 24″ centers. The sheathing is some kind of cardboard, about 1/8″ thick. Very bad installation of batt insulation throughout. Building plans have disappeared, and I’m wondering how to size equipment. It’s also very air-leaky. Originally, the condos had ceiling electric radiant. In units where the radiant still works, the bill runs around $400/month for identical units between November 1st and April 15. It seems like a worst case scenario, based on BTU/sf might be almost as accurate as a guess filled manual J. What do you think?
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