what is R factor? how do you have UV on the windows? 0 Y3 E l* G/ DChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability." L1 K6 l; }6 d6 t
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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. 0 y% ^/ x1 f) p7 L0 x6 m9 |+ X0 C6 h D9 ^* \7 {1 e. r/ {
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.. ], M8 Q, ]/ h$ q7 o0 @1 b2 W
0 m2 Y4 R* s4 S1 }% y0 |2 E5 mHere 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.+ i3 K# S4 E: [7 M1 Q i7 ~/ z$ |
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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? 4 E- [' s& g; K& \4 fChiaPet 发表于 2011-2-18 09:09
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Ask your builder to give you an exact quote. - e( P' ?$ J5 E/ _% S, ], RYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote.* r! f+ R* `9 P, S/ H
You don't have to upgrade all the windows. Only the important ones.6 M/ `) Y( ?: Y! D- \
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 ...5 [. y0 p# G) f' M r
amy-china 发表于 2011-2-18 16:09