Free Calculators
Run your own numbers before anyone quotes you theirs. Every calculator shows its working, needs no signup, and never asks for your contact details.
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Pick the sentence closest to your situation.
Rebate Eligibility Checker
Answer three questions and see which incentives still apply to your project in 2026 — including the fuel-switching rule that decides most heat pump cases.
Try the calculator →Solar Payback Estimator
See roughly how many years it takes for solar to pay for itself based on your system size, cost, and electric bill.
Try the calculator →Battery Runtime Estimator
Estimate how long a home battery could power your house during an outage, based on what you choose to back up.
Try the calculator →Quote Comparison Worksheet
Put up to three installer quotes side by side — normalized to cost per watt, with missing inclusions and sales red flags surfaced.
Try the calculator →Heat Pump vs. Gas Furnace
Compare the rough annual operating cost of a heat pump vs. a gas furnace based on your local energy rates.
Try the calculator →Electric Bill Analyzer
Split your electricity use into heating, cooling and always-on baseload — from as few as three months of bills.
Try the calculator →Get the next guide
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