This article was paid for by Lowe's. When you buy through our links, we earn a commission. Learn more. When it’s time to shop for new windows, it can be daunting if you’ve never done it before.

Edward and Lynn Kaufman bought a dozen new windows from Lowe’s last year. They were installed by a Lowe’s subcontractor who did a terrible job, the couple said. “Besides the windows being garbage, the ...