Ford window regulators can break down at all times. Although they do not wear as such, they are sensitive to dust, dirt or humidity. If you notice your Ford's window having difficulties rolling down, it may be time to replace the regulator. In the end, the window is likely to get stuck.
In case of electric windows it is important to check the switch as well though. If that works properly, the regulator needs replacing.
The cost of window regulators largely depends on the model of your Ford. To determine which window regulator you need, please select the model and engine of your Ford into the search menu.