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Room Air Conditioner Sizing: Six ENERGY STAR Steps

Size a window or room AC using floor area and heat-load conditions.

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Wikimedia Commons · Photo: Andreyanov D / Wikimedia Commons, CC BY 3.0, unmodified. · CC BY 3.0 Unported ↗

This is ENERGY STAR guidance for US window or room air conditioners. Other systems may use different sizing rules; follow installation and product guidance.

Your try-it-at-home checklist

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1. Measure length and width to calculate floor area.
2. Find the matching BTU/h range in ENERGY STAR's room-size chart.
3. Apply the guide's adjustments for heavy shade or direct sun.
4. Consider occupancy and extra kitchen heat where relevant.
5. Avoid oversizing; cooling too quickly can reduce dehumidification.
6. Check window fit, mounting, drainage, insulation and electrical requirements.

Your try-it-at-home checklist

Further reading

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