What are some common issues that can arise with HVAC drain systems and how can they be prevented or resolved?

Common issues with HVAC drain systems include clogs, leaks, and mold growth. These issues can be prevented by regular maintenance, such as cleaning the drain lines and ensuring proper insulation. Clogs can be resolved by using a wet/dry vacuum or a plumber's snake to clear the blockage. Leaks can be fixed by tightening connections or replacing damaged parts. Mold growth can be prevented by keeping the system clean and dry.