HVAC Load Calculator

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An easy-to-use HVAC tool for calculating necessary thermal output capacity (in BTUs)

Our HVAC load calculator uses the square foot method, enhanced with key contributing factors such as insulation, windows, and other variables that influence heating and cooling demand.

To begin, simply select your region and enter the height and area (length × width) of the space. The calculator comes preloaded with standard default values based on commonly used assumptions. You can adjust these at any time by clicking the “Additional Factors” button to view and modify advanced settings.

Because most air conditioning systems are available in ½-ton increments (6,000 BTU/hour), this calculator provides a close estimate of the actual system size you may require.

Note: This HVAC calculator is provided strictly as a quick method of computing general size and value conditions. Square foot methods are considered rule of thumb for use in quick calculations. The exact thermal load can be determined by using a full heat load analysis.

Disclaimer:

The recommended BTU loads were determined in good faith and are intended for general informative purposes only. We do not take responsibility for or guarantee any completeness, reliability, or accuracy of this information. There can be several other unique factors in certain applications that significantly affect and even falsify these values. You should always consult a licensed design engineer for the most accurate measurements and values, which can only be truly obtained after a thorough inspection of the job site is performed and all related factors are determined.