by Dr. Ofellati » Thu 12 Nov 2009, 15:55:20
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I'm sorry, but what's Poly U? Are you talking about some kind of light tunnel from the roof? Or a passive thermal collector?
And who wants to live in a house with no windows?!
Jeez dude, polyurethane. It's a standard foam insulation.
I'm not saying no windows.
What I'm saying is this . . . passive solar is usually a euphemism for "lots and lots of windows." Rather than have a "passive solar" system, it's much simpler, cheaper, and easier to just have a lot fewer windows.
A 2x4x8' wall, 20 feet long with a staggered stud design and two inches of polyurethane and a 3x4 or 3x5 window is cheap and easy to build and can be heated with a candle.
Take that same wall and put in 100 square feet of southern facing windows and you jack the price by a huge amount and generate huge heat loss through the glass.
But you've made my point. By saying, "who wants to live in a house with no windows," what you're really doing is acknowledging that passive solar is really a way to continue to have cheap-oil sized windows on houses as oil gets more expensive. Won't work.
If it will work, show me the house in Vermont.
The future of homes is not passive solar. The future of homes is smaller homes with fewer windows.