I have been researching Energy Efficient windows. Am I wrong it seems the best windows are being manufactured in Canada. Jay
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The best in North America. I am told that many European windows put most American stuff to shame.
Here in Manitoba! We can have -40C in Winter and +40C in summer. So windows have to be good to withstand that range . We, however, don't have the driving rain than you may get at a costal location, but all windows are tested for infiltration and specs are available.