A window air conditioner (window AC) is a self-contained cooling unit that installs in a double-hung, slider, or casement window to remove heat and humidity from a single room. Window ACs are affordable, quick to install, and available in capacities from 5,000 to 24,000 BTU to match small bedrooms up to large living areas.
Choose reliable cooling from brands known for performance and value:
Use this BTU chart to size your window AC. Measure the room’s square footage (length × width). Adjustments: add ~10% BTU for sunny rooms or kitchens; subtract ~10% for shaded rooms.
| Room Size (sq ft) | Recommended BTU | Typical Usage |
|---|---|---|
| <150 | 5,000 BTU | Small bedroom, nursery |
| 150–250 | 6,000 BTU | Bedroom, small office |
| 250–300 | 7,000 BTU | Office, guest room |
| 300–350 | 8,000 BTU | Primary bedroom |
| 350–400 | 9,000 BTU | Large bedroom, den |
| 400–450 | 10,000 BTU | Studio, small living room |
| 450–550 | 12,000 BTU | Medium living room |
| 550–700 | 14,000 BTU | Large living area |
| 700–1,000 | 18,000 BTU | Open concept room |
| 1,000–1,200 | 21,000 BTU | Very large room |
| 1,200–1,400 | 24,000 BTU | Extra-large room |
Note: Casement or slider windows require models specifically designed for those window types. High ceilings, multiple occupants, or significant heat sources (electronics, cooking) may require stepping up one BTU size.
Stay cool and comfortable. Explore our latest window air conditioners and find the perfect fit using the BTU chart above at ShopAppliances.com.
