Construction

HVAC Load Estimator

This simplified Manual-J estimator gives a quick BTU/hr load for residential HVAC sizing. Enter square footage, ceiling height, climate zone, and insulation quality to get a cooling and heating estimate. Always verify with a full Manual-J before purchasing equipment.

Conditioned Area (sq ft)

Ceiling Height (ft)

Climate Zone

Insulation Quality

Occupants

Windows (count)

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Cooling BTU/hr

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Heating BTU/hr

Disclaimer: simplified estimate only. A licensed HVAC contractor should perform a full Manual-J before equipment selection.