what is R factor? how do you have UV on the windows?4 q6 w' T; S! o$ `1 @. M
ChiaPet 发表于 2011-2-18 08:53
/ s% [, k3 c; f7 r' C9 n1 aR factor is used to determine insulation capability. % b0 p3 S% E4 A1 `4 C7 @ ' F4 D* U: ^2 r1 f. HHere 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 {6 K, f' i7 F ( s' H' F& X+ V2 \" YHowever, 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 # A7 n R+ R, N7 q* S% a
R factor is used to determine insulation capability.* s& z3 z2 W3 P) z
- q8 p/ p$ C2 B3 Z7 X* H1 X) QHere 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.- b9 O- m( P b( m& ~. m; O
... 2 @& h; k& P" E: H) [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. ) o! _6 N& X/ |; ]; x) UYou don't have to upgrade all the windows. Only the important ones. # \: w4 ]) i! @# }, N9 l7 Y小黄 发表于 2011-2-18 09:13
我觉得不会,去年我买的新房装有空气换气系统,有三档,最低一挡是每20分钟就RUN一次,屋里温度夏天也是阴凉阴凉的,很舒服.BUILDER告诉我用最低档每月大概比不用增加$5,不管增加费用是不是这么低,总之我没发现比人家增加 ...7 q8 d g8 w& V: F' u, s, _5 w) z
amy-china 发表于 2011-2-18 16:09