Lucid brings Gravity’s UX to the Air, but older owners must pay $950

This one is outside what Retrofit Relay covers. The site focuses on home energy upgrades — things like heat pumps, insulation and air sealing, weatherization programs, and rebates such as HEAR — not car software updates.

If you're weighing an EV purchase alongside home energy upgrades, it might still be worth knowing that automakers sometimes charge existing owners for hardware needed to run new features, as described in this Lucid story. But there's nothing here about home efficiency, rebates, or equipment for your house to summarize.