what is R factor? how do you have UV on the windows?9 O9 g( S# `) g( p# u# \& L7 s
ChiaPet 发表于 2011-2-18 08:53
# L; e9 Y% s" M d+ @2 u+ ER factor is used to determine insulation capability. + L6 W8 r# [& `* z) Y ! k$ E( e! A& g- O: v$ zHere 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. 6 U* G$ X# p$ U5 r6 T- a" @5 |, {6 S8 e0 p" ^. a, p
However, 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.
本帖最后由 ChiaPet 于 2011-2-18 09:12 编辑 4 I u5 F; s9 ?' v6 x" a# m
R factor is used to determine insulation capability. ' M$ ?+ T( a K, F( X1 @7 Q. I% h: I' I
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. * Y$ C* z6 [" b- m9 |* M ... % E" ?% D+ H( {+ x( ?4 L9 t; O6 j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?
would sun-stop coating cost too much? 1 j. K1 R& Y, q0 \0 W. ^1 ?# s* wChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote.6 _. [4 ]8 j6 \8 p5 N4 F
You don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote. . ^/ |+ e: J% n5 l( LYou don't have to upgrade all the windows. Only the important ones./ g. ~% F1 J3 w1 |
小黄 发表于 2011-2-18 09:13