Lennox air conditioner runs continuously and struggles to reach set temperature on very hot days.

Safety: Turn off power before cleaning or sealing ducts.

• 1. Clean indoor and outdoor coils: Ensure both coils are clean to maximize capacity.
• 2. Seal accessible ducts: Use mastic or UL-181 foil tape to seal obvious leaks in accessible ductwork.
• 3. Improve attic insulation and shading: Reducing heat gain can help an existing Lennox system keep up.
• 4. Have charge and sizing checked: A technician can verify refrigerant charge and confirm the system is properly sized for the home.

Note: Continuous running is not inherently harmful if airflow and charge are correct, but indicates limited capacity.