There are ways to improve the look of your windows and increase the value without the cost of completely replacing your windows. You can add the cross-braces (called muntins or mullions in the glass world), remove the cross braces. Add a low-e energy efficiency coating. All these things can add aesthetics and value to your home at a fraction of the cost of full replacement windows.
As the weather gets colder, many homes lose efficiencies through their windows. IF yours is foggy, you should consider replacing just the panels with broken seals. It is not often necessary to replace the entire windows, especially if the frame is in good working condition. Our trained technicians will be able to assess the conditions of your windows to determine whether they can be repaired. It's worth a phone call to inquire. It's cheaper to replace the failed units than the whole window and frame.