ballard 发表于 2013-8-20 22:18 ! K. Q/ K% V+ L* {; ~) 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。1 X8 d4 g1 F. p% y8 V
: S2 W; C+ g8 {# O* \$ p& U0 t大家都晒晒 就知道了 ...
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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. / _' x4 f; k: F8 K0 F 2 V. i5 |1 j. ]$ s
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.