We were in the process of purchasing an older home and our inspector noticed that the existing windows had mould between the windows (they were double hung) because the seals were no longer doing the job. We got 3 quotes on getting the windows retrofitted, which were all fairly close in price, and decided to go with the dealer from Window City. They did a great job with the installation, and were very tidy. If I did it again I would have spent a bit more to get the new windows entirely because the aluminum cladding for the retrofits doesn’t look as nice as the trim on new windows. We were also able to negotiate the price down on the overall cost of the home, because of having to get the new windows installed, thanks to the inspector.