Mostly installers--probably about 7-10 years ago back when the American manufacturers got pushed out of the market by the Chinese ones.

A lot of the installers got out of the business knowing they were on the hook when the warrantees came calling.

Although, American manufacturers have been restarting since Biden adjusted some of the tariffs in 2023.

We'll see if they go back to producing a decent product or if they just try to shovel garbage like China.