February 22, 2010
Dear Mr. Gilkey,
I thought you might be interested in my experience with your windows. I bought my condominium in Fairborn, Ohio new in 1984. After about 20 years, the windows were in bad shape (I don't think the original windows were of high quality to begin with). I replaced all of my windows and two sliding glass doors with Gilkey windows in two stages, summer 2005 and summer 2006.
As a statistician, I am compelled to look at numbers. The average kilowatt hour (kwh) useage for the three calendar years prior to window replacement, 2002, 2003 and 2004, was 1095.64 kwh; for the three years after installation, 2007, 2008, and 2009, it was 640.83 kwh. This is a 41.5% drop in kwh useage. A plot of the average kwh useage (averaged over the 12 months) for each year, 2002 - 2009, is attached.
With this drop in kwh useage, I figure it will take about ten years for the windows to completely pay for themselves. It's a nice feeling to know that I'm being energyefficient and that, in the long run, I'm saving money at the same time. It's important to point out that this is not a valid, comprehensive statistical study but, rather, anecdotal evidence of a single case. Incidentally, I use these data in my statistics classes to illustrate various statistical methods.
You are welcome to use this information for advertising/marketing purposes, but please notify me and acknowledge me if you do so.
With kind regards,
H. J. Khamis, Ph.D.
