- Instant answersResults update as you type.
- Private by designRuns in your browser. Nothing is sent.
- Share, print or citeCopy a link with your numbers.
800 sq ft room
The ENERGY STAR chart puts a 800 sq ft room at 18,000 BTU/hr.
| Situation | BTU/hr |
|---|---|
| Normal | 18,000 |
| Heavily shaded (−10%) | 16,200 |
| Very sunny (+10%) | 19,800 |
| 4 regular occupants (+1,200) | 19,200 |
| Kitchen (+4,000) | 22,000 |
Worked example
A sunny 800 sq ft living room used by 3 people: 18,000 × 1.1 = 19,800, plus 600 for the third person = 20,400 BTU/hr. Round up to the nearest unit size sold.
Frequently asked questions
How many BTU for 800 sq ft?
18,000 BTU/hr (ENERGY STAR chart), adjusted for sun and occupancy.