ballard 发表于 2013-8-20 22:18 " F" b/ R* b3 O' U" s r# f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。 : `+ E" m- g/ Z% p* h; N6 g, K! S, ~ R/ N% k5 P) z0 R$ o8 j& G {: a, V; A0 x; c
大家都晒晒 就知道了 ...
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+ {# k7 O' p; M; M' q1 p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. : q0 w+ W& q9 i4 e# D" Y: L3 D1 z+ z9 a
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.