ballard 发表于 2013-8-20 22:18 $ I: W2 `% h1 C( G% `+ R. 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。3 f8 Z4 Q/ T/ F9 h
- D8 B" i5 G! d0 q. j* @大家都晒晒 就知道了 ...
% A6 |: c2 T; d9 E, U2 N 5 o+ W# [. |" A D: H9 c2 a. B! R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. , L o) m) }0 ]1 j% S 4 B! ?8 ~2 Q3 a8 R \
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.