Credits

Listings come from official company websites and office pages. Each listing names the date we checked. We don’t display operator photographs in this first version; companies can add photos they own when they update a listing.

Cost and operating figures on the calculators come from Angi, Kichler, and the U.S. Department of Energy. Links and dates are on each calculator page.

The path-light mark in the header is a simple in-house mark, not a photograph of a real install.