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那么 renovation能做什么, 屋顶肯定室容易做, 但是墙壁呢?2 m: P" R4 c2 p) r( }% p
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屋顶和墙壁的改进分别对夏季和冬季保温性能 那个贡献大?# i1 ^0 W. f. X& F* [3 f* g/ T
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投入是多大?
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.