There are many varieties of windows available in the market. Windows are
a good source of air circulation inside the house or any construction and they also provide light inside the house. Windows are the best means to have a good deal of sunlight inside the house.
I strongly suggest you to visit Double Glazing to learn more about this.
Windows provide sunlight with the glasses that are attached to them. Windows can be fixed as well as the can be opened and closed. There are many varieties of windows available, small windows, ventilator windows, medium windows and French windows. All these windows can be opened and closed when not needed. When you need good air circulation inside house or if it is hot you can open the window and give good wind inside the house.
If the other way if there is too much of wind outside you can close the panel and thus protect yourself from wind or heat by closing them. The four sides of the window panels are made up of many different varieties and these varieties differ according to the budget as well as the climatic conditions. Even the paints used for these panels differ from climates. Some climates needs some kind of paints as extreme weathers needs good and high quality paints.