HVAC Heat Load Estimator

Quick Manual J style estimates.

Building Specs

Square Footage

Ceiling Height (ft)

Climate Zone

Insulation Quality

Windows

Occupants

Kitchens

Estimated Load

Cooling Load

0 BTU

0 Tons

Heating Load

0 BTU

Required heating capacity

Recommended System Size

Rounded up to nearest 0.5 ton

This is a simplified estimate based on general rules of thumb. For precise sizing, a full Manual J calculation is recommended, which accounts for exact orientation, shading, duct leakage, and local weather data.

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