Tools & Calculators
HVAC calculators, built on certified data
Every incumbent sells you leads. We give you the math first. These calculators run on the same AHRI / ENERGY STAR performance data behind the rest of the site — no sign-up, no sales call.
Heat Pump Finder Live
Three questions — home size, climate, ducts — and we match you to the certified heat pumps that actually fit, ranked by the number that matters for your climate, with installed cost and where to buy.
Operating-Cost Calculator Live
Enter your local electricity and gas prices → get $/MMBtu delivered heat and annual cost for a heat pump vs. furnace vs. electric resistance. Our money stat.
Window AC or Mini-Split? Wizard Live
Six questions — rent or own, heat too, noise, window type, budget — and the data decides which type fits your room, with the certified top pick either way.
Repair or Replace? Live
Your AC, furnace or heat pump just died. Run the 50% rule and the $5,000 rule against your own repair quote and system age — see the math, including when the two rules disagree.
Is My Heat Pump Quote Fair? Live
Enter your quote and system size → your real $/ton against the national marketplace average for ducted vs. ductless, plus the questions to ask before you sign.
Sizing Calculator Live
BTU load and tonnage by square footage and climate zone — right-size equipment before you shop, and catch a contractor who’s overselling.
Rebate Finder Coming soon
ZIP → federal, state and utility incentives you actually qualify for (25C expired 12/31/2025; state + HEEHRA still live).
Heat Pump Payback Live
Extra upfront cost minus rebates, divided by your annual energy savings — the honest years-to-break-even, plus your 15-year net.
Filter / MERV Selector Coming soon
Match a furnace filter by size and MERV — with the MERV↔MPR↔FPR crosswalk.
Calculators use published performance ratings (SEER2 / HSPF2 / AFUE) and EIA energy prices. Formulas are documented in our methodology. We never estimate a spec that isn't published — missing values render as "not published," never guessed.