The answer to 'how often to replace dehumidifier' is that most dehumidifiers need to be replaced every 5-10 years, depending on usage and maintenance. Dehumidifiers are an important appliance for controlling indoor humidity levels, but like any mechanical device, they have a limited lifespan. With proper care and regular cleaning, a dehumidifier can last towards the upper end of that range, but eventually the internal components will wear out and the unit will become less efficient or stop working altogether.
It's a good idea to inspect your dehumidifier annually and replace it if it's not performing as well as it used to. Signs it may be time for a replacement include increased energy usage, reduced moisture removal, or unusual noises coming from the unit. Replacing the dehumidifier before it fails completely can help prevent moisture problems in your home.