The answer to 'heat pump making noise' is that there are several common causes, including worn bearings, loose components, and issues with the compressor. Symptoms may include grinding, squealing, or rattling noises coming from the outdoor unit. Solutions can range from simple DIY fixes to more complex repairs that require a professional HVAC technician.
If the noise is mild and the heat pump is still operating normally, you may be able to address it yourself by lubricating moving parts or tightening loose screws. However, if the noise is loud, persistent, or accompanied by other issues like reduced airflow or poor performance, it's best to call in a professional. They can diagnose the root cause and make the necessary repairs to restore your heat pump to proper, quiet operation.