Effective July 25, 2026

Terms of use

By using HVAC Cost Lab, you agree that calculators and guides provide general educational planning information only.

No professional or contractual advice

Results are not bids, warranties, engineering designs, load calculations, code approvals, safety inspections, financial advice, or instructions to perform regulated work. Consult qualified professionals and local authorities before purchasing, installing, modifying, or repairing equipment.

No guarantee of accuracy

We work to make formulas and sources transparent, but actual costs, performance, savings, incentives, codes, utility rates, and site conditions vary. You are responsible for verifying information used in a real decision.

Acceptable use

You may use the public tools for personal planning. You may not interfere with the site, misrepresent its output as a certified design, or reproduce substantial content as your own service.

Third-party services

Links, advertisements, and third-party services are provided for convenience and may have separate terms. HVAC Cost Lab is not responsible for third-party products or services.