We had our windows replaced a few years ago with Milgard fiberglass frames and the highest UV protection we could get (since we live in Hawaii).
Yes, the UV filtering seems to be pretty good and the fiberglass frames don't warp in the heat like vinyl has a tendency to do. The house is wonderfully quiet when the windows are closed.
However, I'm disappointed with the overall purchase for several reasons:
The quality of the workmanship is very poor. The joints on all the windows have glue sticking out that is impossible to remove. After these few years, that glue has attracted dirt that makes the window corners look very poor. I tried GOOP and several other cleaners before
I wrote to Milgard asking for hints on any ways to clean it up but never received an answer.
The screens on some of the fiberglass frames are very tight and difficult to get in and out. After accidentally bending two of the screen frames, I had a local screen pro come in to build new ones and he told us that the tightness was OK for vinyl frames but should not be that tight for fiberglass.
Finally, the lifetime warranty does not apply to Hawaii (and if I remember correctly - nor within 2 miles of any ocean).
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