The quality of Penguin windows does not justify the expense. It would take more than 20 years in energy savings to recoup the cost. I installed Milgard a few years ago for less than half of what Penguin was going to charge. Absolutely no problem with Milgard windows and I have several very, very large windows. If you have lots of $$ and don't know what to do with it, by all means go with Penguin.
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