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Room width (ft)

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For a 12 ft × 15 ft room (180 sq ft) with average sun exposure, and 2 regular occupants, you'll want a room air conditioner of about 6,000 BTU/hr.

Recommended cooling capacity

6,000 BTU/hr

That's small-room territory — bedrooms, offices, and modest living rooms, covered by the most common window-unit sizes.

Units in this class run on a standard 115 V household outlet. Match to the nearest retail size (5,000 / 6,000 / 8,000 BTU), and resist sizing up "to be safe" — an oversized unit short-cycles and leaves the room cold but humid.

Room area (Energy Star table unit): 180 sq ft

Base table capacity before adjustments: 6,000 BTU/hr