Direct answer
Use this checklist to ask how sizing was calculated, what assumptions were used, what the installation requires and what should be verified before purchase.
template
Printable questions to ask an HVAC contractor about sizing method, ducts, airflow, electrical needs, installation and warranty.
Use this checklist to ask how sizing was calculated, what assumptions were used, what the installation requires and what should be verified before purchase.
Sizing assumptions are centralized and show source URLs, check dates and notes.
Checked 2026-05-22. Used for room AC preliminary BTU rule, room-level sizing caveats and oversizing humidity cautions.
Checked 2026-05-22. Used for portable AC SACC / label caveats.
Checked 2026-05-22. Used for pints/day and product rating caveats.
Checked 2026-05-22. Used for residential bathroom fan CFM rules and fixture model.
Checked 2026-05-22. Used to define Manual J, Manual S and Manual D boundaries.
Checked 2026-05-22. Used for mold and water intrusion disclaimers.