No furnace required: Energy-efficient 'passive houses' gaining steam

Judd Blunk's house is like a womb. Although the temperature outside is in the 20s, his triple-pane windows overlooking the Fox River feel warm from inside.

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<p><a href="http://www.physorg.com/news154199408.html">No furnace required: Energy-efficient 'passive houses' gaining steam</a></p> <p>Judd Blunk's house is like a womb. Although the temperature outside is in the 20s, his triple-pane windows overlooking the Fox River feel warm from inside.</p>