I purchased 26 Renewal by Andersen windows June 2010 and boy am I sorry now. Paid over $23K. Most of the windows are casement and are working fairly well except where the windows were installed in the opening (leaks air), but the two worst offenders for air leaks that I have are the double hung windows. Once faces North the other South. These two double-hung were over $11oo a piece since the windows are 3.5x6.5. Right now I have 35+ MPH NW winds (as I write it is now 45+) and the window is howling with air pouring in... and I mean pouring in... read full review »