In the present economic climate repairing windows and doors versus replacement is a no brainer! Most people don’t have the money to replace faulty windows and doors for the newer more energy efficient new ones but if repairs are kept in check and seen to as need rather than letting faults build up costs would be more manageable.
There are a number of things that can go faulty over time and most are repairable. Things like draughty windows (as some people say the seals are gone), they usually require hinges. Windows and doors need adjustments from time to time. This summer (2013) was quite warm and caused doors to expand and go out of alignment. Get windows and doors a check up to prevent more serious faults from occurring.