what is R factor? how do you have UV on the windows? 7 O5 h/ K/ E8 B1 RChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability. |# Q3 ?) m0 E8 z' c6 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.& A: p2 [" ^/ B% @6 E
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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.
R factor is used to determine insulation capability. 3 x2 ^( v8 u7 h* `7 R: d/ H2 z* m* \: ?/ l* ]
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. ( d0 Y. f5 M0 ], V0 q! n5 ~' Y% E ... ; x1 x$ y" z% p, q% J: `/ {$ O小黄 发表于 2011-2-18 09:06
+ K H& C9 y' G0 T0 qThank you for your reply. But would sun-stop coating cost too much?
Ask your builder to give you an exact quote. * O& ]0 x2 W& kYou don't have to upgrade all the windows. Only the important ones. 1 u. p5 ^( N& v: [& ]2 G: a小黄 发表于 2011-2-18 09:13
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it must be one of the best, get lot of sunshie, summer may be a little hot, but winter it will be so marm.