what is R factor? how do you have UV on the windows? % c7 ]/ y& V8 j4 g% UChiaPet 发表于 2011-2-18 08:53
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R factor is used to determine insulation capability.% v5 s! a5 d+ Q J! W+ a( ] R
8 T7 i& P6 C: y" jHere 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.! [/ _( \$ N, @! Q6 s+ U! m( D4 C
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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. ! i1 ?! G+ b& |! Y/ R% b$ {% S r$ t5 J
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( m( U$ k$ H; Z2 ?/ Q2 J1 e ... [3 i+ p) ^, ]9 P
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. 7 j# W( H8 ]6 EYou don't have to upgrade all the windows. Only the important ones. ( N7 z: m, u+ Y" W) c3 c4 a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$5,不管增加费用是不是这么低,总之我没发现比人家增加 ...$ s2 D- g. ^; e8 L' ~; C; f
amy-china 发表于 2011-2-18 16:09
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谢谢你的信息,我也正在考虑是不是东西朝向的房子(客厅,饭厅,花园向西,bonus房间向东)会比南北朝向的好,因为可以两边都有阳光进房,唯一担心就是夏天客厅,饭厅房间西晒会热?很想再确认确认,期待你的答复,万分感谢!