People with faulty windows at home should prepare for an increased energy consumption in the long run.. When the windows of a house are badly installed, there will be poor insulation throughout the house. Comprehensive sash window repair kits will be helpful in renovating your home. Prior to choosing a kit, make sure that you have measured your windows accurately. It is also important that you check the frames on the windows as well. The kit will illustrate to you the processes you need to follow. Your home can have windows which are good as new again, with the right maintenance.