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Earth Tubes Q&A

Earth tubes (earthtubes, or earth-air tubes) are underground tubes that use geothermal energy to cool or heat temper the air for your home. It works like cheap air conditioning because you can build it yourself for several hundred dollars and it is FREE to run (no electricity needed). Being completely passive, this is a sustainable […]

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How to Make Earth Tubes for Passive Cooling

Cheap Air Conditioning is what Earthtubes (earth-air tubes / earth tubes) are all about! You can build your own earth tubes for passive cooling/natural cooling for about $150 per tube. They can completely replace your air conditioner(s) on your home, provided you follow some important steps and make them correctly.

Earth Tubes

We built […]

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Difference between solar cooker and solar oven

Is there a difference between an “oven” and a “cooker” for solar cooking?

Solar “oven”

Well, although these terms are actually most often used interchangeably, it is generally called an “oven” if you put the food inside the insulated walls of the box, similar to a regular kitchen oven.

Solar “cooker”

Also, it is generally […]

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Which is Superior—Passive Solar, Hybrid Systems, or Active Solar?

The paper below is something I researched and wrote about at age 19 in college, and although we have made great strides in technology since then, I am amazed at how relevant the information still is in 2015, some 25 years later (boy am I starting to feel old, haha). However, I definitely have a […]

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