ballard 发表于 2013-8-20 22:18 & ?2 P0 b. ~% A) q5 g$ q; E! G' x我家的房子,冬天上午, 太阳足的时候,自然达到17-18度。 房子07年的。' i0 A6 o% U: u" n0 |7 T3 p4 p- B
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大家都晒晒 就知道了 ...
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7 O7 Q; E6 x b# G; s我家的房子,冬天上午, 太阳足的时候,自然达到25度。 房子02年的。I did upgrade the ceiliing insulation from R20 to R60 though.2 P0 g' h! C/ I( _3 w" E2 Z5 t
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40% is lost from ceilling. 40% from windows. so 屋顶改进分别对保温性能贡献大. Costed me $2000, because I used the Pink insulation ( usually for walls) at the ceiling. If you use foam that usually for ceilling, then your cost should be only 1/3 of mine. Rent a foam spreader from HomeDepot.