http://www.the-open-mind.com/how-to-build-a-solar-heating-panel-using-soda-cans//
If
you’ve got good sun exposure on one side of your house, you can take
advantage of free heat from the sun with this DIY solar heating panel,
which uses old soda cans to collect and transfer the sun’s energy into
your house....
the-open-mind.com
Gotta pass this on to my hubby. We're always looking for ways to learn and save while teaching young people the same. Thanks for posting this.
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