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Aluminum windows vs. aluminum-coated plastic windows

 We are currently planning to replace our 30-year-old wood windows (for design and air tightness reasons) and are now considering what type of windows to choose. We are hesitating between a "real" aluminum window or a plastic window with a matching aluminum finish.

In my layman's opinion, coated plastic offers the advantage of both worlds: cheapness combined with high durability and weather resistance. Am I wrong?

• windows
• aluminium windows