ballard 发表于 2013-8-20 22:18 8 m& X9 e) V7 b1 `$ Q7 k# a
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。- M6 S) K c3 U: M1 o
; r G. b8 t+ s# [% O( j大家都晒晒 就知道了 ...
$ y5 Z7 C8 A% h1 X
2 z% Q0 E2 w/ b# T7 N8 b0 y- {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 x. T/ O, ?( w0 Y$ y ^5 B3 W' D: J Y, q" N! Z& ?% t: O, s( h
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.