ballard 发表于 2013-8-20 22:18 , y; P4 j7 W; x8 O; C9 i O5 ?
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。' L( }( e+ [1 c' N3 G5 M' A
5 K6 j! h& }/ Z3 ?7 e# H& w% ?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. ! a, _/ X% \. v; | F' ]1 b- [1 Y. H, a) F
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.