Began Solar Heater project

Plan to build a box to fit in the window in my shed an insulate inside box with thin aluminum foil like insulation. Build tubes from soda cans with holes drilled in bottom for air circulation . Use Hightower temp caulking to glue cans together. Place on window seal so window acts as a front barrier trapping the heat in. Small 12 v fan powered by solar cell to full hot air our

Drilled out 15 cans tonight, need high temp caulking and silver-insulation. Will pull fan from old PC