The answer to 'why is my condenser smells bad' is that a smelly condenser unit is often caused by mold, mildew, or rotting debris buildup. This can happen when the condenser coils become dirty and moisture accumulates, providing an ideal environment for bacterial growth. The bad odor is a sign that the condenser needs cleaning and maintenance.
Some common symptoms of a smelly condenser include a musty or rotten smell coming from the outdoor unit, reduced cooling performance, and visible mold or algae growth on the coils. To fix this, you'll need to thoroughly clean the condenser coils and remove any debris or organic matter buildup. This is typically a job best left to a professional HVAC technician, as they have the right tools and expertise to properly clean and maintain the condenser unit.