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Aircon BTU size calculator

Find out roughly what cooling capacity (BTU) your room needs before buying or installing a new air conditioner. Oversized or undersized units waste money and cool poorly.

Recommended capacity
8,500 - 10,500 BTU

This is the estimated cooling capacity needed; a contractor will confirm exact unit size during a site visit.

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This is a rough guide only; ceiling height, windows and insulation can change the result.

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Your calculator inputs and the estimate are included with your enquiry, so providers can quote your actual job. Just add your area, timing, and how to reach you.

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Last updated 2026-08-02