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Interesting...black painted cardboard for solar window heater. This simple device a traditional window & turnd it into a simple sun powered heater. Materials: Large piece of corrugated cardboard, Black paint, Paintbrush, Knife or scissors. South-facing window (east or west is okay but not as good). Blogger says zzz'air flowing in the bottom at 63 F and back out the top at a little over 100 F. Pretty hot for a piece of painted cardboard. The temperature outside is about 35 F."

Heat your garage or green house with solar power. At the bottom of the post is a link to a bigger, better soda pop panel but this is the "tutorial"

DIY Solar Water Heating. pin now and read later-Maybe we could use this for the pool?

Building a solar panel heater out of aluminum cans

DIY Solar Water Heating Cut your water heating bills 50 percent with this sun-powered solution!

a home made passive solar heater. free heat during the day, but doesn't work at night. would be cool for an ice house in the Midwest while ice fishing to save on propane heat

Make a Homemade Solar Window Heater: Does it work? Here I've got air flowing in the bottom at 63 F and back out the top at a little over 100 F. Pretty hot for a piece of painted cardboard. The temperature outside is about 35 F.

How to Make a Passive Solar Water Heater. Following these directions you can build an inexpensive water heater that will heat water to 150 degrees.

It's easy when you know how...... passive solar heating | Passive Solar Heating Systems

These are so easy to make your own. U.S. Solar Heating | Solar Heating Panels, Solar Preheat Ventilation

How to make a difference - Cliimate Change and energy - How to make a solar water heater from plastic bottles - The Ecologist

DIY solar heater made from soda cans. Should be enough heat for a green house.