Source: Energy Vanguard / Allison Bailes / June 20 2023
For new homes that haven’t been built yet, there’s only one good way to size an air conditioner. You need to have a load calculation done. (The same applies to heat pumps, furnaces, boilers, or any kind of heating and cooling equipment.) For homes in the US, the standard way to do this is to use Manual J, the load calculation protocol from the Air Conditioning Contractors of America (ACCA).
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