Two years ago Virgil Johnson invented an energy-saving solar air heater for homes. He sold a do-it-yourself eBook online on how to build one.
This one also has an option for a solar pump and comes with a do-it-yourself 25-page booklet that can be bought on eBay and printed in PDF format.
Johnson says his setup uses mineral-free, cost-free rainwater that’s sprayed on air-conditioning condenser coils to keep them cool and clean.
Your air conditioner works more efficiently and the system doesn’t rely on city water — or, for country residents, well water that contains rust, lime and other minerals. Such particles can accumulate and clog up air conditioning coils.
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