What Size Air Conditioner Do I Need?

Room size alone is not a reliable sizing method. Calculate heat gain using floor area, ceiling height, insulation, window orientation, solar exposure, occupancy and equipment. Compare common 2.5 kW, 3.5 kW, 5.0 kW and 7.0 kW classes only after the cooling load is understood.

What to check before choosing

9,000, 12,000, 18,000 and 24,000 BTU/h are common nominal marketing classes. Actual capacities and model specifications vary. Ask a qualified professional for a room-by-room assessment.

Next steps

Use a room-by-room heat-load assessment that considers ceiling height, glazing, solar gain, insulation, occupancy and heat-producing equipment before comparing model capacities.

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