Americans are asleep, post European windows
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They seem expensive.
Not really. What you see on the picture can be had for as little as like 200-300 EUR depending on the glazing, moreover it's not something you buy every day - usually only when you renovate every 10-15 years or whatever.
That IS expensive.
Wait until you hear about the price of a whole renovation.
Sure is more than the average yearly wage here.