ballard 发表于 2013-8-20 22:18 1 r3 S* I& @. ^: `
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。 k* u3 T7 F' \' y# N0 d3 f
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大家都晒晒 就知道了 ...
. `# m+ G3 p) D( h ; K3 ~) y! v/ Q) ]6 l! B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.* c. |: q3 k+ ?5 R+ s
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.