BTU Calculator
Calculate heating and cooling loads instantly
Free tool with a path into installed-base follow-up
Why this tool matters
Solve the calculation or lookup now, then keep the answer attached to the installed base so it can support maintenance follow-up, warranty timing, equipment history, and replacement conversations later.
Next best step
Use the result in the field, then start a free AssureStep account when you want the context to stay visible after this visit.
Typical: 1,000 - 3,000 sq ft for residential
From tool to workflow
Free tools answer one question. AssureStep keeps the answer usable across the installed base.
Start free when you want maintenance follow-up, warranty timing, equipment history, and replacement opportunities to stay tied to the customer record instead of disappearing after the job.