Every part of the replacement window is important. In many cases you replace your old windows, because you couldn't open or close them. Every window is as good as it balance system. So let’s have a look what types of balance systems are used in replacement windows.
Block and Tackle Balance System
This type of balance system uses composite cords to connect the coil spring to the balance shoe. Many manufacturers guarantee, that you can use window sashes for about 28000 times. The big plus of the block and tackle balance system is that it does not need lubrication. So you don't have to worry about your window sashes getting stuck. The minus of this system is that it can be used in double pane glass windows. It can’t be applied to triple pane glass windows.
Constant Force Balance System
This balance system works by utilizing a rolled coil steel spring to counter the balance of the weight of a window sash. Constant force balance system is widely used. Both in double and triple pane replacement windows. Many manufacturers guarantee that both sashes can be opened and closed for up to 15000 times. The negative side of this balance system is that all the dirt and dust accumulates in spring casing. It makes the operation of the window harder. Replacement windows with constant force balance systems may need maintenance after 20-25 years.
Spiral Balance System
The spiral balance relies on tension applied to spiral rod inside a balance tube. When you open or close the window, some tension is applied by turning the spiral rod that extends out from the bottom of the tube counter clockwise. Spiral Balance system was widely used in replacement windows. Lately most window manufacturers switched to constant force or block and tackle balance systems. The main problem with this balance system is that it provides of up to 1000 cycles of usage. The more you use the window the weaker the spiral spring becomes and sashes are not stay open, they fall down. The other negative side of this balance system is that it needs lubrication from time to time.
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