Know what home energy actually costs you — before you spend.
Free, no-login calculators built on real US state-level data. Estimate solar payback now that the federal tax credit has changed, compare a heat pump to your furnace, and see what charging an EV really costs.
Try the Solar Payback Calculator →Pick a calculator
Each tool comes with a plain-English guide and a transparent methodology. Numbers are estimates, not quotes.
Solar Payback Calculator
How long until panels pay for themselves in 2026 — with the post-25D federal credit reality and your state's incentives.
Home Energy Cost Calculator
Break down your annual electricity bill by appliance and state, and find the biggest savings.
Coming July 2026Heat Pump vs Furnace
Compare annual and 10–15 year costs of switching from gas, oil, or electric heat to a heat pump.
Coming August 2026EV Charging Cost
What charging at home vs public stations costs per year — and how it stacks up against gasoline.
Coming September 2026Why EcoSmartNest?
Most energy calculators online still run on stale assumptions — and in 2026 that's an expensive mistake. The residential federal solar tax credit (Section 25D) expired on December 31, 2025, so a homeowner buying panels with cash or a loan this year gets $0 in federal credit. The 30% incentive now survives only through third-party-owned lease/PPA arrangements (Section 48E, through 2027) and state programs. Our tools are built around that reality, so your estimate reflects the rules that actually apply to you.
- Real state-level data — electricity rates, sun hours, and incentives vary enormously by state, and our calculators use per-state numbers.
- Transparent methodology — every tool explains exactly how it computes its result and cites its sources.
- No login, no selling your data — the calculators run in your browser; we only load analytics and ads with your consent.
Start with the big one: solar
It's the decision with the largest dollars at stake — and the one most affected by the 2026 rule changes.
Open the Solar Payback Calculator
