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450 sq ft room
The ENERGY STAR chart puts a 450 sq ft room at 10,000 BTU/hr.
| Situation | BTU/hr |
|---|---|
| Normal | 10,000 |
| Heavily shaded (−10%) | 9,000 |
| Very sunny (+10%) | 11,000 |
| 4 regular occupants (+1,200) | 11,200 |
| Kitchen (+4,000) | 14,000 |
Worked example
A sunny 450 sq ft living room used by 3 people: 10,000 × 1.1 = 11,000, plus 600 for the third person = 11,600 BTU/hr. Round up to the nearest unit size sold.
Frequently asked questions
How many BTU for 450 sq ft?
10,000 BTU/hr (ENERGY STAR chart), adjusted for sun and occupancy.