Uses the same engine as the full calculator (occupants 2, one large window assumed).
| Cooling load | — |
Common 1,300 sq ft dimensions: 26×50 ft, 25×52 ft, 20×65 ft. If you searched for one of these room sizes, this is your page — the load math depends on area, not shape.
US (whole home, central system): at the moderate-climate rate of ~22 BTU per sq ft, 1,300 sq ft works out to 28,600 BTU/hr, i.e. a 2.5 ton unit. Your climate zone shifts this substantially:
| US climate zone | Cooling load | Central AC size |
|---|---|---|
| Zone 1 — Hot (FL, S.TX, AZ desert) | 36,400 BTU/hr | 3.5 ton |
| Zone 2 — Warm (Deep South, TX) | 32,500 BTU/hr | 3 ton |
| Zone 3 — Moderate (TN, NC, MO) | 28,600 BTU/hr | 2.5 ton |
| Zone 4 — Mild (Mid-Atlantic, PNW) | 26,000 BTU/hr | 2.5 ton |
| Zone 5 — Cool (Upper Midwest, New England) | 23,400 BTU/hr | 2 ton |
India: 1,300 sq ft spans several rooms — Indian homes cool room-by-room with one split unit each. Use the whole-house calculator to plan units per room instead of one big system.
These 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, including ceiling height, sun exposure and occupancy.
| Area | US central AC | India (single room) |
|---|---|---|
| 1,100 sq ft | 2.5 ton | multiple units |
| 1,200 sq ft | 2.5 ton | multiple units |
| 1,300 sq ft | 2.5 ton | multiple units |
| 1,400 sq ft | 3 ton | multiple units |
| 1,500 sq ft | 3 ton | multiple units |
0.75 ton 1 ton 1.5 ton 2 ton 2.5 ton 3 ton 3.5 ton 4 ton 5 ton
About 28,600 BTU/hr for a 1,300 sq ft US home in a moderate climate (22 BTU/sq ft), rising to 36,400 BTU/hr in hot Zone 1 climates like Florida or Arizona.
In a moderate US climate with average insulation, a 1,300 sq ft home carries roughly 28,600 BTU/hr of cooling load, which calls for a 2.5 ton system. Hot climates (Zone 1–2) push the load 15–25% higher; cool climates pull it lower.
1,300 sq ft is larger than a single Indian room — size each room separately with the whole-house calculator and fit one split unit per room.
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How these figures are derived: BTU per square foot, honestly · refine for your exact room with the full tonnage calculator.