Homemade Solar Thermal Collector

Step 3 Window Frame

Next, I had to use the saw to make the plywood fit the back of the window frame. After the back of the collector is adjusted, apply the duct insulation  self adhesive foil and foam to the inside of the window frame and on the back of the collector. Covering the entire backing will help create a good seal when attached to window frame.

Attach the refrigerator metal backing to the back of the solar thermal collector that is covered with insulation. Attach with metal plumbing/fastening attachments. I used two and that securely attached the refrigerator backing sufficiently.

Drill two holes in window frame on opposite ends of the window. Drill a hole where the bottom of the collector is (the cold in) and on the opposite side, drill a hole at the top (the hot out).