Estimates — add extra for waste and confirm with your supplier.
A common rule is about 20 BTU per square foot, adjusted for sun exposure and extra occupants. We convert to tons (12,000 BTU = 1 ton) so you can size a unit.
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About 20, adjusted for sun and occupancy.
12,000 BTU/hr of cooling capacity.
Yes — sunny rooms need more, shaded rooms less.
No — a sizing estimate; a Manual J load calc is precise.