Rule second: please contact a responsible seller!
Correct savings mean not a decrease in one -time value, but also the search for quality products. Agree that it is better to spend money once on good windows than to regularly replace it or suffer from discomfort and constant humidity. The responsible seller and the manufacturer will be able to calculate the cost of plastic windows, and will also provide quality guarantees that will be strictly described in the concluded agreement. Product quality should also be confirmed by certificates and technical documentation.