ballard 发表于 2013-8-20 22:18 % T3 l5 @5 w0 L D0 P0 O8 c. Q, x4 X8 n' S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。2 k0 A, q' m8 h( k& n
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* s1 X* l% U- K7 d ' H0 O/ Y5 r5 {' e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.2 R+ y! d ~# T; D" g6 f! z4 G
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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.