Stairwell From HGTV Green Home 2012

The home's "light well" climbs three stories to a dramatic cupola.
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The three-story staircase also serves as a natural circulation chamber: When windows are opened on the main floor, hot air rises to the cupola, where windows open via remote control to evacuate the air. 

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2012 Green Home Cupola

Brian Patrick Flynn checks out the cupola in the 2012 HGTV Green Home.
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