How it works
Use the ENERGY STAR room-size guidance for 8 ft ceilings, then adjust broadly for ceiling height and sun.
Simple example
A 250 sq ft average-sun room starts around 6,000 BTU/h.
Home Maintenance
AC / Cooling Size Calculator
Get a preliminary room AC capacity range.
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Common question
Is this an HVAC load calculation?
No. Insulation, climate and occupants affect sizing; professional sizing may be needed.
This is a planning estimate. Check product instructions, dimensions and site conditions before purchasing or building.
Sizing reference: ENERGY STAR room air conditioners.