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.
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.
Energy & Green Tech
Feb 18, 2009
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