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  • Tammy May

    Under $10 heat box - 30 degree difference! ?!

  • Chris Tee

    How to Build a Heat Box for $6, Heat your Home Free Doesn't look nice, but will heat a 500-1000 square foot home from the sun's energy. Amazing.

  • Lucy Lenkewicz

    The EPA, and Mother Earth, have expressed interest in "Passive Solar Heat Box" units for home and commercial building heating. We decided to build one, 4.5' ...

  • Robin Mundy

    How to Build a Heat Box for $6, Heat your Home Free. Click on the "about" button for more building directions.

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