Well on my new windows in a section listed energy performance ratings theree is a u’facotr a solarheatgain coefficient and a visible transmittance. I went on the web site listed and not much help at all. I was wondering highter the better or lower and on which ones. That is all most of us want to know but they cant make it that easy!
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U factor is the inverse of the R-value so a lower U factor is better. .3 - .35 is pretty good. As far as solar heat gain and VT they are kind of inversely proportional. In other words film coatings and the like make the glass less clear.
check this web page out: http://www.eere.energy.gov/consumer/your_home/windows_doors_skylights/index.cfm/mytopic=13320
and also:
http://www.energystar.gov/index.cfm?c=windows_doors.pr_anat_window
Edited 10/28/2006 6:45 pm ET by Matt
Thank you sooo much matt. You have the paitence to read through the site to find what I got frustrated with . Thanks again!!!
Edited 10/28/2006 10:16 pm ET by kayaker