ballard 发表于 2013-8-20 22:18 ! V! x; J$ \& j: u5 I2 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。0 W @2 {8 J% x, p* v2 t
\9 w1 N- a- R) V) b9 O大家都晒晒 就知道了 ...
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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. $ C3 {9 O1 I) O9 f1 [, Z5 { ?! R1 Z4 y. a1 ?( W$ l# B
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.