Water dripping from supply registers or sweating on ductwork during cooling

Safety first: Be cautious when working in attics or crawlspaces. Watch for exposed wiring and weak structures.

Steps:

• 1. Check filter and airflow: Ensure proper airflow to prevent excessively cold supply air.
• 2. Inspect duct insulation: In unconditioned spaces, verify that supply ducts are fully insulated and that the vapor barrier is intact.
• 3. Seal duct leaks: Use mastic or UL-181 foil tape to seal visible leaks at joints and seams, especially near the air handler and trunk lines.
• 4. Control humidity: Use the system’s dehumidification mode if available, or run a standalone dehumidifier in very humid climates.
• 5. Adjust thermostat: Avoid setting the thermostat extremely low, which can drive coil and supply temperatures down and increase condensation.