what is R factor? how do you have UV on the windows?. g. {. A9 Z h9 t' s, {4 g# Z
ChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.' ^$ O( E. G- X: |! |5 N
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Here in Canada, walls are well over R20. So, even if the exterior walls are hot under sunlight, it won't really affect interior living space. 2 n/ b" J: b' P 5 r2 d: q: Q8 IHowever, windows have lower R factors and allow UV radiation (and radiation of other frequency) to enter the house. So, it's best to upgrade your windows, if radiation (i.e. sunlight) is a potential problem. Typically, you can upgrade your windows to triple pane, with sun-stop coatings on both sides.
R factor is used to determine insulation capability.% _3 ]" V: G' {1 A" W6 f
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Here in Canada, walls are well over R20. So, even if the exterior walls are hot under sunlight, it won't really affect interior living space.# R* J5 Y+ I B) q. |. d F, F" K0 A
... $ j! D* y" N5 T小黄 发表于 2011-2-18 09:06
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Thank you for your reply. But would sun-stop coating cost too much?
Ask your builder to give you an exact quote.$ C9 }$ s. R0 A( ?! l
You don't have to upgrade all the windows. Only the important ones. ; y }! f' C' T1 M小黄 发表于 2011-2-18 09:13