 鲜花( 1181)  鸡蛋( 48)
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what is R factor? how do you have UV on the windows?, r! f9 }9 Z1 A# ]" M
ChiaPet 发表于 2011-2-18 08:53  , z3 @6 Q8 i7 a- U/ H' d7 `6 V
R factor is used to determine insulation capability., q9 o8 ^* i" f( a5 c
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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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