Windows-New Construction vs. Replacement

Our contractor has advised us that replacement windows installed by most of the Window companies will not be securely attached to the building and therefore will most likely move and not work properly. He thinks that buying Marvins for replacement is foolhardy-like taking expensive cloth to a cheap tailor. He recommends going with a lower line of windows for replacement and a higher line for new construction. I would appreciate any thoughts on this.

By Jane |