Last updated: September 2026
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Use of This Site
The calculators, guides and content on this site are provided free of charge for personal and professional reference. You may use the results for your own HVAC work, studies, or job preparation. You may not copy, republish, or resell the content or the calculator tools themselves without permission.
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The calculators on this site give estimates based on standard HVAC formulas and industry rules of thumb. They are not a substitute for a licensed engineer’s load calculation, a manufacturer’s official specification, or a qualified technician’s on-site inspection. See the Disclaimer page for full details.
Accuracy of Content
Every effort is made to keep formulas and reference data accurate and up to date, and to cite the standard (ASHRAE, ISO, NIST, etc.) each calculator is based on. However, HVAC equipment, refrigerant regulations and local codes change over time — always verify critical decisions against the equipment manufacturer’s current documentation and your local building code.
Changes to These Terms
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