The sun’s energy can be captured by homemade solar hot-air collectors and thermosiphoning panels to provide free heat. The units direct air warmed by the sun through a window or wall opening into the ...

While some of the highest technology in the world is being brought to bear on the problem of saving energy, here’s a guy who painted 50 soda cans black, drilled holes in them, stacked them up inside a ...

Adapting solar thermal tech used at utility-scale plants, start-up designs system to use the sun's heat to power industrial chillers and drastically cut peak electricity use. Martin LaMonica is a ...

It took a while to decode the email I received from Carroll Hampleman (you can see why below), but his home made water heater is worth the bother. Mirrors are arranged to reflect and concentrate the ...

If you have at least one unshaded, south-facing window, you can use a solar heat grabber to direct warm air into your home. Wouldn’t you love to heat your home with free energy from the sun? There are ...