Disclaimer
⚠ Important: AskHVAC.ca calculators are tools for preliminary analysis and educational purposes. They are not a substitute for professional engineering judgement, certified load calculation software, or permit-ready calculations. Always verify results with a qualified HVAC professional before making equipment or construction decisions.
1. Results are estimates
Every calculator on AskHVAC.ca produces an estimate based on the numbers you enter and on published industry formulas and standards, including ASHRAE Fundamentals, ASHRAE 62.1 and 62.2, the National Building Code of Canada, and AHRI and Natural Resources Canada ratings. Results depend on the accuracy of your inputs, on site conditions the tool cannot see, and on assumptions stated on each calculator page. Two people can enter slightly different inputs for the same job and get different results, and both can be reasonable estimates.
2. Not professional advice
Nothing on this site is professional engineering advice, and nothing here creates an engineer-client relationship. AskHVAC.ca is published by Muhammad Kashif, who is not an HVAC engineer. The calculators are built from published standards so that homeowners, students, technicians, and designers can check their own numbers, not so that the site can replace a licensed mechanical engineer. For final equipment selection, system design, and any work that affects safety, comfort, or compliance, work with a qualified HVAC professional or licensed mechanical engineer.
3. No warranty
The site and all calculators are provided "as is" and "as available" without warranties of any kind, express or implied. We do not warrant that results are accurate, complete, or suitable for any particular purpose, that the site will be available continuously or free of errors, or that results comply with any specific building code, jurisdiction, or regulatory requirement. Use of the calculators is at your own risk, and you are responsible for checking every result before you act on it.
4. Building codes and permits
HVAC rules differ by province, municipality, and building type, and codes are updated over time. A result that fits one jurisdiction may not fit another. Calculator outputs on this site are not permit-ready calculations and are not a substitute for certified load calculation software or for the documents your local authority having jurisdiction asks for. Before submitting anything for a permit, have the work reviewed by a qualified professional who knows the code in force where the building stands.
5. External links and references
The site links to external resources, including ASHRAE, Natural Resources Canada, and other reference sites, and cites published standards on calculator pages. These links and citations are provided for convenience and for checking our sources. We do not control external sites and are not responsible for their content, availability, or privacy practices. If you find an error in a calculator or a reference on this site, please tell us through the contact form so it can be corrected.
6. Contact
Questions about this disclaimer? Contact us at [email protected] or through the contact form.