The answer to 'heat pump smells bad' is that a bad smell coming from your heat pump is often a sign of an underlying issue that needs attention. This could be caused by a variety of factors, such as mold, mildew, or bacterial growth in the system, a refrigerant leak, or even a dead animal in the unit. The smell can range from musty to rotten, and it's important to address the problem promptly to prevent further damage and potential health hazards.
If the smell is mild, you may be able to address it yourself by cleaning the unit and checking for any visible issues. However, if the smell is strong or persistent, it's best to call a professional HVAC technician to diagnose and resolve the problem. They will have the expertise and equipment to properly identify and fix the issue, ensuring your heat pump is running safely and efficiently.