― We are busy enough with our work and our daily life is full of stress so we do not have time to check our window and doors for winter. Sometimes we found out big gas or electricity bill at the end of the year but we did not realize how that happens. There is lots of discussion with owner of the house if all are correct, but we neglect to check our doors and windows before winter arrived. ∙ The best way to solve this problem is by making sure all our doors system working functionally. [...].