Practical AtlasIndependent reference
ESP
KOR
JPNHS-T01Standalone tool
Cooling BTU estimator
Screen a room air-conditioner capacity range from area, ceiling height, sun exposure, and occupancy.
Screen a cooling load.
Estimate a room-equipment range. This is not a central-system sizing decision.
COMMON WAYS TO ASK
- What size air conditioner do I need?
- Estimate room AC BTU
- Calculate cooling capacity by room size
QUICK ANSWER
What this calculator tells you.
Screen a room-size capacity range using floor area, ceiling height, sun exposure, and occupancy. Construction, climate, air leakage, and connected rooms can change the final load.
A shaded 300 ft² bedroom
INPUT300 ft² · 8 ft ceiling · 2 occupants
RESULTA screening range, not a whole-home load calculation
Questions people ask next.
Is a larger air conditioner always better?
No. Excess capacity can cool quickly without running long enough to manage humidity well, while undersizing can lead to long run times and poor comfort.
Does this replace a Manual J calculation?
No. It is a room-unit screening estimate. Whole-home equipment and difficult spaces need a load calculation that accounts for climate, envelope, ducts, and ventilation.