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A Faulty Composite Door Replacement Lock Can Increase Your Energy Bills If the mechanism for your composite door is defective, it may be difficult to shut or lock. This can put your home's security at risk, and can increase your energy costs. It's easy to repair a composite lock. It can be fixed in a few easy steps and could help you avoid the expense of replacing your doors made of composite. Fixing a faulty cylinder Composite doors are strong and are a great investment in any home, but they aren't immun