HVAC Load Calculator

Determine the right heating and cooling capacity for your space. Get BTU recommendations, unit sizing, and estimated annual energy costs.

Property Details

Square Footage

Climate Zone

Ceiling Height (ft)

Insulation Quality

Number of Windows

Sun Exposure

Recommended Capacity

Cooling BTU/hr
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Suggested Unit Size

Est. Annual Energy Cost

Load Breakdown

Factor	BTU Contribution	% of Total

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Disclaimer: This tool is for informational and educational purposes only. It does not constitute professional HVAC, engineering, or energy advice. Results are estimates based on simplified Manual J calculations. Actual load depends on ductwork, local codes, occupancy, and other factors. Consult a licensed HVAC contractor for accurate sizing. StellarClose LLC is not liable for actions taken based on this tool.