Parameters of window
Windows is an important element of the house, on the one hand, they have to pass a lot of light to the room; the other should be well insulated from the cold. You should look at some parameters to secure the highest quality.
Important for thermal insulation is the thermal insulation value – Uw. If you choose window, where the rate is less or equal to 0.6W, then a window will not let the cold into our homes.
The second parameter, which should be noted is the permeability coefficient of solar energy – g. The higher the g the more sunlight goes on our rooms, thus they will be brighter and warmer.