Using empty soda pop cans, a wooden frame, vacuum hose, and plexiglass you can

While I have electricity out to the garage now, heat has been an issue all
winter long. Mattar graciously lent me his kerosene heater, which did an okay
job of taking the bite off the chill. Insulating the garage would go a long way
to help keep the bitter Vermont cold out, but that’s a project for another day.
I decided instead to take advantage of the south-facing side of the garage and
build a solar furnace to collect some of that sunshine just bouncing straight
off my garage. My dad built one years ago and said he recorded a 110-degree
temperature differential between inlet and outlet. And I had enough scrap
materials around the basement to do something similar to what my dad built years
ago.