Data Sources and Verification Policy
Where PowerProof Home's numbers come from, how calculators and guides are verified, and how every fact is dated.
This policy covers the facts, figures, and assumptions in our guides and calculators: safety rules, food safety timelines, electricity rates, solar production, product specifications, incentives, and costs.
Sources we use
- U.S. government agencies and their open data, such as the U.S. Energy Information Administration (electricity prices), NREL (solar production through PVWatts), ENERGY STAR and the Department of Energy (efficiency), USDA and FoodSafety.gov (food safety), the CDC and the Consumer Product Safety Commission (generator safety), Ready.gov and FEMA (preparedness), and the IRS (tax credits).
- Manufacturer manuals, specification sheets, and safety notices.
- Utility and state energy office program pages.
- Codes and standards bodies, cited by name and edition where relevant.
- Approved product feeds from affiliate partners, for product names and links only.
- Our own calculations, with the formula shown.
What we do not use
We do not scrape or republish proprietary databases, user reviews, protected photos, or copyrighted descriptions from other websites. When we summarize information, we write our own text and link to the source. We do not invent test results, search volumes, prices, or savings figures.
Verification
- Every calculator lists its assumptions and shows how each result was calculated.
- Time-sensitive facts such as incentives, rates, and prices carry the date we checked them, or are left out and linked instead.
- Guides are re-checked on a schedule and whenever a reader reports a change.
- Information we cannot verify is labeled as such or not published.
Your responsibility
Rates, incentives, codes, and product specifications change. Confirm current information with your utility, the manufacturer, or the official program before you buy, and use a licensed electrician for any work on home wiring.
Report a change
Report incorrect information or email corrections@powerproofhome.com.