ballard 发表于 2013-8-20 22:18 + `4 O, C# N: L( K0 H# [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。 . y5 P- W, }5 `* {1 G; y( i O9 y+ W# |, F. F
大家都晒晒 就知道了 ...
/ i, f) O. v5 f1 f 0 i, x: i) Q5 W2 }, I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. % q# x) s# W; _& t' j 5 r! j V; O8 U
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.