Rule of thumb: 30 BTU per sq ft in moderate climates. Cold climates 25, hot climates 35. One ton equals 12,000 BTU. Actual sizing requires Manual J calculation by professional accounting for insulation, windows, orientation. Oversizing causes short cycling and poor humidity control.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
Cooling capacity: 1 ton equals 12,000 BTU/hour of heat removal from home.
25-35 BTU/sf depending on climate, insulation, sun exposure. 30 BTU/sf average.
Short cycling, poor humidity control, wasted energy, higher costs, uneven temperatures.