ballard 发表于 2013-8-20 22:18 R* @. G) c7 a. E2 b2 x2 w
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。 / H y* N% f0 C, x; D+ c( S. b3 x& y
大家都晒晒 就知道了 ...
( O4 h' C. y" y& Y/ r 4 |' Z1 X6 J" Q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.0 d! e7 t# {( i& S9 Q- p' r6 R
" T1 C0 R3 d. V P; f0 @- X
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.