what is R factor? how do you have UV on the windows?7 a: I# r- t0 ?$ @" x
ChiaPet 发表于 2011-2-18 08:53
/ U4 F/ W1 _- N$ B$ }( v4 QR factor is used to determine insulation capability.$ B5 z3 H( f4 M: t5 c! p* {6 p
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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. , ?3 _9 v1 u6 B, ?4 ^ / ?- J* z6 C. K5 k9 k1 jHowever, 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 . f z. l; j6 g( m
R factor is used to determine insulation capability. & m$ l6 G; k z! j4 ^" j. B m& u) a9 f. i! ~2 Z
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. ) t$ N0 S: |& q3 l5 D$ _* F ...' N+ i g4 s7 e" ]3 O1 T6 ?% A! ~
小黄 发表于 2011-2-18 09:06
3 D' F2 X% x$ A+ kThank you for your reply. But would sun-stop coating cost too much?
would sun-stop coating cost too much? 7 C! O: q8 T+ Q) QChiaPet 发表于 2011-2-18 09:09
% W, ]% k) L8 k4 V6 oAsk your builder to give you an exact quote. * F! _" f& ^. I: F3 pYou don't have to upgrade all the windows. Only the important ones.
Ask your builder to give you an exact quote." V S4 v) T- x! b1 B7 M- N
You don't have to upgrade all the windows. Only the important ones. ! M' a- |' O- u9 n+ b3 y& t: y小黄 发表于 2011-2-18 09:13