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What Size AC for a 1500 Sq Ft Room?
24,000BTU
for a standard 1500 sq ft room — see the table for sun, kitchen, and occupancy adjustments
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| Situation | AC size to buy |
|---|---|
| Standard room | 24,000 BTU |
| Very sunny room (+10%) | 26,500 BTU |
| Shaded room (−10%) | 21,500 BTU |
| Kitchen (+4,000) | 28,000 BTU |
| Room sleeping/seating 4 people | 25,000 BTU |
| Central air equivalent | 2 tons |
These figures follow the Energy Star sizing chart. For portable ACs, compare using the SACC (DOE) rating on the box, which runs 40–50% below the marketing BTU number — a 1500 sq ft room wants roughly 15500 SACC BTU.
An oversized unit short-cycles and leaves the room clammy; undersized runs nonstop and never catches up on hot afternoons. When between sizes, round up only for sunny rooms, top floors, or poor insulation.
Other room sizes
100 sq ft150 sq ft200 sq ft250 sq ft300 sq ft350 sq ft400 sq ft500 sq ft600 sq ft800 sq ft1000 sq ft
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