Observed arrival · 2026-10-11
HomeBTU’s HVAC and home-energy calculators
A free set of calculators for sizing home HVAC, water-heating, backup-power, and insulation needs, plus estimating installation and running costs.
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- For
- Homeowners planning HVAC or energy upgrades
- Worth noticing
- Its stated method combines IECC climate zones, 1%-design temperatures, ACCA Manual S limits, and state-adjusted labor indexes.
Field notes
The calculator catalog spans equipment sizing, backup power, airflow, moisture, insulation, and replacement budgets. HomeBTU says it begins with a home's size and IECC climate zone, and that its cost estimates adjust national installed-price ranges by state labor index. The listed comparisons include yearly heating costs and a 15-year total for heat pumps versus furnaces.
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○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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