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那么 renovation能做什么, 屋顶肯定室容易做, 但是墙壁呢? 8 H" E6 R* L% _: P( O 8 y" n' `0 ]. W y! y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?3 f. C) E1 A% R' i# H
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.