I had 10 Anlin windows and one sliding door replacement install about 20 year ago and just now need to have the inner seals or spacers and hardware replaced. I called Anlin and they honored their life time guarantee on parts I only had to pay for labor $500. I think it would have to do with the contractors installation of windows when the problems arises. The only thing I have a problem with is if you need to install addition window they make it difficult to buy you need to go thru there list of contractors and most will have a minimum install I only have room for one window. can anybody recommend contractor who will install just one Anlin window or which window is comparable.