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BTU (British Thermal Unit) measures the amount of energy needed to raise one pound of water by 1°F. For air conditioning and heating, BTU/hr ratings indicate how much thermal energy a system can move per hour. The right BTU capacity prevents under-cooling (too weak) or short-cycling (too powerful).

Водич корак по корак

1. 1Start with 20 BTU per square foot of living space
2. 2Adjust for ceiling height: multiply by height/8 (standard 8ft ceiling)
3. 3Factor in climate zone, sun exposure, and number of occupants
4. 4Add 600 BTU per person beyond two regular occupants

Worked Examples