ballard 发表于 2013-8-20 22:18 " c1 [5 x4 Q) B' p0 |2 I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。+ K' r8 r8 t* O) P2 a6 T* N! D
% a6 h( d( R" M% r+ p大家都晒晒 就知道了 ...
2 a4 K A; p3 \ 8 \) P" S3 W2 A" K* w) X6 w( D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 d$ v; o. b- b
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.