ballard 发表于 2013-8-20 22:18 - ?: u b( m) j* ^5 H" q
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。- `% Y+ c7 a. k7 S& q; ^1 Q; Z3 k) b
3 d# p' E6 S0 A% F5 f' M; B大家都晒晒 就知道了 ...
, Q! O7 j8 {1 P1 ~7 s9 b , \" L# a3 L' R/ T% x3 `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. 3 |3 @+ ?& ~& f, W: U9 K+ Y 2 i5 S" a) p% f' J) B# K
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.