Browse Forums Windows & Doors Re: How to compare u-values of windows e.g. 3.0 vs 4.5 2Jul 04, 2015 10:01 pm The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: How to compare u-values of windows e.g. 3.0 vs 4.5 7Jul 07, 2015 11:27 am Quote: The window coverings will also affect the overall U-value. If you're going to have thick curtains and pelmets, they have their own u-value of around 7 themselves, so the combined U-value for the 4.5 window is u=1/(1/7+1/4.5)=2.74, and for the 3.0 it's 2.1. Thanks onejohn. I knew curtains contribute significantly to the thermal efficiency of external windows and doors but I was unsure of the figure. Stewie Personally, considering your layout (study/work desks in bedrooms), I don't think you have any other option but to leave NW windows and make them as big as possible e.g.… 7 10483 Hi, I'm planning to build a new house and wanted to get some feedback on the different window designs for a master bedroom. Our bedroom is north facing and the bed will… 0 4560 I’m restoring all my 40yr old windows and I want to install seals around the casements. I’ve sanded back and oiled the frames with sikkens. My plan is to box up inside… 0 6520 |