HVAC BTU Sizing Calculator (Room)
- BTU/hr needed
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- Tons
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- kW
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Manual J calculations are required for whole-house sizing. This is a single-room cooling estimate (~20 BTU/sq ft baseline).
About this tool
HVAC BTU Sizing Calculator (Room) is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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