Window World claims that they are fully warranted for all problems..My first problem was that the largest window in my house was messed up...Screens did not fit also they were scratched ..Never did get that resolved.. Since having windows done I had more work done on the house to make it more energy efficient...my electric bill never did go down. About a week or so ago I had the Energy Efficiency Management come and do an energy eficiency evaluation to see where my problems are still coming from, they do a very extensive test and measure... read full review »