It is believed that the best window profiles are produced in Germany and in Poland (experts claim that this is true);
The insulation must be as dense as possible, because if it is excessively porous, moisture will fall into it, and there is also the possibility that insects will start there or mold may appear (you can ask the master-conservation, what kind of insulation he advises).
USD
EUR
GBP
BTC
AUD
JPY
CNY
CAD