Observed arrival · 2026-09-17

RetrofitROI Makes Home-Energy Math Show Its Work

retrofitroi.com Observed source

Editorial interest 82/100 Selection signal · not a rating of the site

A browser-based collection of home-energy calculators for comparing costs, payback periods, financing, and breakeven conditions.

Landing page captured for the 2026-09-17 issue.

Field notes

The homepage organizes the project into eight decision areas and says it contains 120 engines, covering choices from solar financing and heat-pump upgrades to utility-rate optimization. Its stated calculation model is deterministic and browser-side: values such as electricity rate and ownership horizon can carry between tools, while entered data is said not to leave the browser. The site also draws a boundary around its role, excluding code-compliance sizing, quotes, financing approval, and contractor work.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

⊠LoginAccess appeared gated

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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