Whether or not to replace old windows before selling a house depends on the condition of the windows and the overall market in your area. If the windows are in poor condition, with noticeable drafts, leaks, or rotting frames, it may be worth considering replacing them. This is particularly true if similar homes in your area have upgraded windows, as it can make your property more competitive and appealing to potential buyers. However, if the windows are still functional and relatively well-maintained, investing in other renovations or improvements that could provide a higher return on investment might be a wiser choice.