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Window AC Size Calculator

Window AC BTU with sun and kitchen adjustments.

Inputs

Inputs and assumptions

Room floor area.

20 shaded, 25 sunny (ENERGY STAR sizing table).

Add 4,000 for kitchens; 600 per extra occupant beyond two.

Result

Window AC size (BTU/hr)
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What to check

  • Room dimensions
  • Sun exposure
  • Kitchen or extra occupants

Related calculators

Rule-of-thumb screening estimate, not an ACCA Manual J calculation. Confirm with a room-by-room Manual J load calculation and installer quotes before buying equipment.

Saved calculations

Keep the assumptions with the result.

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