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what is R factor? how do you have UV on the windows?' P) d& [$ _2 D# e0 n
ChiaPet 发表于 2011-2-18 08:53  B6 V- P, N$ Z, n0 u2 U
R factor is used to determine insulation capability.4 Y$ ` n1 S+ M" D- C/ k/ V1 ^, g5 O! ?
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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.
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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. |
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