Standard room sizing assumes 8-foot ceilings.

AC Size Estimation

This tool helps you choose the right air conditioner by estimating the proper BTU size for your room.

Your estimate

Recommended cooling capacity

Use this as a practical room-level target for a window AC or through-the-wall unit.

Small room
4,800 BTU/hr
About 0.40 tons of cooling
Area240 sq ft
Base load4,800 BTU
Occupancy adjustment0 BTU
Kitchen adjustment0 BTU
Ceiling factor1.00x
Sun factor1.00x
Final estimate4,800 BTU

This calculator is a practical estimate for NYC residents, not a full Manual J load calculation. For unusual layouts, whole-apartment central systems, or severe insulation and humidity issues, use a licensed HVAC professional.

Suggested AC models

Some product options that fit the final cooling estimate.

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