1250 sq ft room
The ENERGY STAR chart puts a 1250 sq ft room at 23,000 BTU/hr.
| Situation | BTU/hr |
|---|---|
| Normal | 23,000 |
| Heavily shaded (−10%) | 20,700 |
| Very sunny (+10%) | 25,300 |
| 4 regular occupants (+1,200) | 24,200 |
| Kitchen (+4,000) | 27,000 |
Worked example
A sunny 1250 sq ft living room used by 3 people: 23,000 × 1.1 = 25,300, plus 600 for the third person = 25,900 BTU/hr. Round up to the nearest unit size sold.
Frequently asked questions
How many BTU for 1250 sq ft?
23,000 BTU/hr (ENERGY STAR chart), adjusted for sun and occupancy.