what is R factor? how do you have UV on the windows?6 S9 w9 P/ g/ \ K
ChiaPet 发表于 2011-2-18 08:53
" j: S& i. ]6 @" g8 c/ M g/ ZR factor is used to determine insulation capability. : b, d3 G( s1 @' M/ P2 x" u8 E; ^# ^! @! }( g4 a+ q3 t
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. 4 Q: m- t2 q4 n8 ?# ?, _' S0 H8 i0 d' e
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." Y7 M6 o! Q& Z0 ]' y3 |" i6 z
# Z# ]/ r) r6 o
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.) f- d4 Z6 ]3 C! x* D( a1 l5 `
... 2 H3 V! x( b$ {. }小黄 发表于 2011-2-18 09:06
: o5 a `- [* }4 w* AThank you for your reply. But would sun-stop coating cost too much?
Ask your builder to give you an exact quote. . I. o* `% \8 H5 k* C) j vYou don't have to upgrade all the windows. Only the important ones. % T, s+ I1 I' Z( |小黄 发表于 2011-2-18 09:13
0 ^- K- N& d7 l0 z* `- G7 ]* O1 A 2 @' k& |6 U. j$ f& y( sit must be one of the best, get lot of sunshie, summer may be a little hot, but winter it will be so marm.