U.S Patent 7,434,577 Canadian Patent 2,643,573
A solar window heater works by circulating air from inside a
room through the system mounted on the interior window sill.
Do-it-Yourself Solar Window Heater
DIY solar air heater collectors are
one of the better solar projects. They are easy to build, cheap to build, and
offer a very quick payback on the cost of the materials to build them. They also
offer a huge saving over equivalent commercially made