A 42,000 BTU air conditioner typically covers up to 1,453 sq ft (135.0 m²) under average conditions.
| Typical room | 1,453 sq ft |
| Shaded, well-insulated room | 2,490 sq ft |
| Sunny, poorly insulated room | 1,211 sq ft |
A room close to this size: 1,000 sq ft room guide.
Check if this fits your room →Computed with ACtopus's room-sizing formula — the same one the interactive calculator uses. Full breakdown: Cooling Sizing & BTU Load.