, R9 P D7 k/ l2 W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. 4 x1 l" j! Y4 e3 R- A% c3 p- h, a0 N/ p F" B
那他家 的房子肯定好啊, ; A4 ^; }* m/ O7 y
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冬季能升温 肯定热损失小吧, 夏季肯定就受日照影响小. 夏季屋顶在日照下烫手啊7 r0 E L, o7 _" [1 ]8 k3 K
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他家 做了屋顶 肯定好了. $ [7 `% G+ r# s& z8 b4 t 4 J; R, S8 ~7 [4 I, c如果没有效果他不会干升级的, 劳民伤财哈,* W: a1 Z. Y1 L3 c) I. j
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.