The extension springs are located on top of your garage door tracks. An extension spring functions in the way the name suggests- it extends. Unlike coiling springs that work when compressed, an extension spring stretches when force extends out the coil. The energy held in the spring is balanced to the quantity of strength it is subjected to. Once the pressure is released, the energy stored in the stretched spring is moved opposite, compressing it back into its tight, spiral shape.

It’s typical to have two springs in each system. The spring works with cables called pulleys and counter cables attached to the stretched springs so that when the door lifts, the tension releases, and the springs squeeze so that the door will raise. Once the door shuts, the springs stretch out again and restore energy for the next time the door opens.