The ideal time for replacing your old front door depends on a number of different factors. The expected cost of repairing a damaged door plays an important role, but also energy efficiency, sound insulation, burglary protection and changes in design preferences. The tighter and better insulated the front door, the less heat will be lost from the inside to the outside and the lower energy will be required to heat or air-condition your house. Security, or an increased need for security, are also important aspects that may lead to replacing an old door.