ballard 发表于 2013-8-20 22:18 8 a$ `; K; D) k' t
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。3 W% t( |. Y% j/ M1 E% i0 _4 z
! i) B; {+ s0 |0 g( f4 D大家都晒晒 就知道了 ...
$ e# X, Q1 f- A: j' d : T1 E- n5 ~: W. N V. I5 \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 }/ O/ P v) L" l. m4 A. g% w7 m2 h# `: l# o* F8 X: F5 ]$ O
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.