AC Sizing

Explanation

Sizing an Air Conditioner (AC) correctly is vital. Undersized, it runs constantly without cooling. Oversized, it cycles on/off too fast (short cycling) and doesn't dehumidify. ### BTUs Cooling power is measured in BTUs (British Thermal Units). - 1 Ton of cooling = 12,000 BTU. ### Rule of Thumb Generally **20 to 25 BTU per sq ft** for a standard room (8ft ceiling). - Bedroom 150 sq ft: 5,000 BTU. - Living Room 400 sq ft: 10,000 - 12,000 BTU (1 Ton). ### Adjustment Factors Add power if: - Sunny room / South facing windows (+10-20%). - Kitchen (+4,000 BTU). - High ceilings (>8ft).

Examples

• Room 200 sq ft: ~6,000 BTU.
• Sunroom 200 sq ft: Needs significantly more, maybe 10,000 BTU.

FAQ