The answer to 'HVAC system leaking water' is that there are several common causes, including a clogged drain line, a problem with the condensate pump, or a refrigerant leak. Symptoms may include water pooling around the indoor unit, water dripping from the vents, or a musty smell. Solutions can vary depending on the root cause, but may involve cleaning the drain line, replacing the condensate pump, or calling a professional HVAC technician to diagnose and repair a refrigerant leak.
If the leak is minor and you feel comfortable doing so, you may be able to address it yourself by clearing the drain line or replacing the condensate pump. However, for more complex issues like a refrigerant leak, it's best to call a licensed HVAC professional who can properly diagnose and fix the problem to avoid further damage to your system.