The answer to 'dehumidifier making noise' is that a noisy dehumidifier is often caused by a problem with the compressor, fan, or other internal components. Common symptoms include loud buzzing, rattling, or grinding noises coming from the unit. This can be caused by issues like a failing compressor, loose parts, or debris buildup.
In many cases, a noisy dehumidifier can be repaired with some basic troubleshooting and DIY maintenance. However, if the problem persists or you're not comfortable working on the unit, it's best to call in a professional HVAC technician to diagnose and fix the issue.