Uses the same engine as the full calculator (occupants 2, one large window assumed).
| Cooling load | — |
Common 2,500 sq ft floor plans: 50×50 ft. The load depends on area, not shape.
US (whole home): cooling load does not scale linearly with floor area. The building envelope — roof, exterior walls, windows — grows with the perimeter, which rises more slowly than area, so larger homes need fewer BTU per square foot. At 2,500 sq ft the rate works out to about 18.3 BTU/sq ft, giving a design load of 45,800 BTU/hr → 4 ton system.
| US climate zone | Cooling load | System |
|---|---|---|
| Zone 1 — Hot (FL, S.TX, AZ desert) | 58,300 BTU/hr | 5 ton |
| Zone 2 — Warm (Deep South, TX) | 52,100 BTU/hr | 5 ton |
| Zone 3 — Moderate (TN, NC, MO) | 45,800 BTU/hr | 4 ton |
| Zone 4 — Mild (Mid-Atlantic, PNW) | 41,700 BTU/hr | 3.5 ton |
| Zone 5 — Cool (Upper Midwest, New England) | 37,500 BTU/hr | 3.5 ton |
India (whole home): 2,500 sq ft is past the point where one split per room stays practical — that would be 10 outdoor units. A ducted or VRF system is the normal choice. Connected load across the rooms is about 16.0 ton; applying a 70% diversity factor (rooms do not all peak together) gives a design load of about 11.0 ton.
| Room | Approx. area | Split size |
|---|---|---|
| Hall / living | ~700 sq ft | 2.5 ton |
| Bedroom 1 | ~128 sq ft | 1.5 ton |
| Bedroom 2 | ~128 sq ft | 1.5 ton |
| Bedroom 3 | ~128 sq ft | 1.5 ton |
| Bedroom 4 | ~128 sq ft | 1.5 ton |
| Bedroom 5 | ~128 sq ft | 1.5 ton |
| Bedroom 6 | ~128 sq ft | 1.5 ton |
| Bedroom 7 | ~128 sq ft | 1.5 ton |
| Bedroom 8 | ~128 sq ft | 1.5 ton |
| Bedroom 9 | ~128 sq ft | 1.5 ton |
Only cool the rooms you use. Sizing every room at once is how Indian households end up with two unused units and a higher connected load than the sanctioned supply allows — check your meter's sanctioned load before adding the last unit.
Figures assume 8 ft ceilings (9.5 ft for India), average insulation and normal sun. Your real number can swing ±30% — run the full tonnage calculator with your actual room data.
| Area | US | India |
|---|---|---|
| 2,200 sq ft | 3.5 ton system | ducted or VRF, ~10.0 ton design load |
| 2,400 sq ft | 4 ton system | ducted or VRF, ~10.0 ton design load |
| 2,500 sq ft | 4 ton system | ducted or VRF, ~11.0 ton design load |
| 2,800 sq ft | 5 ton system | ducted or VRF, ~12.0 ton design load |
| 3,000 sq ft | 5 ton system | ducted or VRF, ~13.5 ton design load |
0.75 ton 1 ton 1.5 ton 2 ton 2.5 ton 3 ton 3.5 ton 4 ton 5 ton
About 45,800 BTU/hr of design load in a moderate US climate — a 4 ton system.
About 18.3 BTU/sq ft. Larger homes need fewer BTU per square foot because envelope area grows more slowly than floor area.
A ducted or VRF system of about 11.0 ton design load. 10 separate splits would be impractical at this size.
100 sq ft 120 sq ft 150 sq ft 180 sq ft 200 sq ft 250 sq ft 350 sq ft 400 sq ft 450 sq ft 500 sq ft 600 sq ft 700 sq ft 800 sq ft 900 sq ft 1,000 sq ft 1,100 sq ft 1,200 sq ft 1,300 sq ft 1,400 sq ft 1,500 sq ft 1,600 sq ft 1,800 sq ft 2,000 sq ft 2,200 sq ft 2,400 sq ft 2,500 sq ft 2,800 sq ft 3,000 sq ft 3,200 sq ft 3,500 sq ft 4,000 sq ft 4,500 sq ft 5,000 sq ft
How these figures are derived: BTU per square foot, honestly · refine for your exact room with the full tonnage calculator.