Maintaining the efficiency of your air conditioning system involves regular cleaning and checking of various components. Ensure the air filter is clean to maintain proper airflow, preventing the evaporator coil from icing up. Regularly check the condensate drain to avoid water damage and control humidity. The exhaust hose should be properly vented outdoors to effectively remove hot air. Also, ensure the coils, compressor, and blower are clean and in good working condition. If the system isn't cooling effectively, it could be due to a refrigerant leak, requiring professional HVAC service.