HVAC units might leak due to several common issues. One potential reason could be clogged condensate drains, which prevent moisture from properly draining out of the system. Over time, dirt and debris can accumulate in the drain line, causing water to back up and leak. Additionally, low refrigerant levels can cause the evaporator coil to freeze. When the ice melts, the excess water can overflow. Faulty installation or a damaged drain pan can also lead to leaks, as the system will struggle to manage the normal condensation that occurs during cooling operations. Regular maintenance helps prevent these issues and ensures smooth operation.