what is R factor? how do you have UV on the windows?4 _3 b2 h# L' L$ x& v1 V
ChiaPet 发表于 2011-2-18 08:53
( q8 M3 C9 T" \- J, u6 NR factor is used to determine insulation capability.( v3 I, O. x; O' i& P7 t
: o' G7 ?9 F2 W D0 C K7 [+ r8 WHere 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. 6 l% T5 @+ @ w7 I( K) j9 J7 A; ?; N% \8 V* y# i- B
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.
本帖最后由 ChiaPet 于 2011-2-18 09:12 编辑 % m$ w: x& z' ~; a' H
R factor is used to determine insulation capability.% }, C( W/ r) ^: m: W' R+ c* D
; @ x) }$ D6 k5 I, U7 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.3 U! g ?: w! g* ^7 @* h& M0 g1 Y
... 7 ?+ x2 ~+ j7 p. ?7 _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 _8 d+ j6 I& A) f9 g" x
You don't have to upgrade all the windows. Only the important ones. " V( }: ?, j, @9 Q. f6 V小黄 发表于 2011-2-18 09:13