Is this home-energy purchase actually worth it?
A heat pump, a battery, a tankless water heater, solar, a Level 2 charger: RetrofitROI turns each of these purchases into a free, browser-side economic model, so you can see the cost, the payback, and what would have to change for a different option to win.
Should I buy this? becomes a transparent, editable model: payback, financing comparison, breakeven conditions, and the next question you didn't know to ask.
Eight decision areas
Solar
Payback by system cost, cash vs. loan vs. lease vs. PPA.
HVAC
Heat pump vs. gas furnace, repair thresholds, SEER-upgrade payback.
EV home charging
Level 2 charger payback vs. public charging and your mileage.
Water heating
Tankless vs. tank, heat pump vs. gas, replacement timing.
Battery & backup power
Battery vs. generator cost, and battery value without solar.
Electrification
Gas-to-electric conversion cost, panel-upgrade impact, sequencing.
Insulation & envelope
Attic, wall, and window paybacks by climate zone.
Utility rate optimization
Time-of-use vs. flat rate, demand charges, community solar.
Not sure where to start? The resources library covers the ideas shared across every cluster, like payback vs. NPV and reading a utility bill.
What it is, and isn't
Every calculation runs in your browser using deterministic finance math, never a black-box estimate; a value like your electricity rate or ownership horizon carries into other tools automatically, and nothing you enter leaves your browser. See methodology, sources, and privacy for the full detail.
RetrofitROI answers "is this worth buying, and which option wins," using your own numbers, never a lead-generation funnel, quote service, or marketplace. It does not answer "what size or gauge does code require"; that sizing and code-compliance work belongs with a licensed contractor, a different job for a different tool.