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We have had our AprilAire humidifier checked twice recently, and the tech keeps saying it is working fine. We have had it for over ten years and the humidity in our house in the winter has stayed in the 40% range. It is now around 20%. They suggest connecting it to hot water. It has worked for over 10 years on cold water. If there is not a problem with the humidifier how can switching to hot water at this point help? Do we just need a new humidifier?