An HVAC preventive maintenance check consists of a complete inspection and diagnostic of the cooling system and a visual inspection of the air ducts. If you have additional HVAC equipment, such as whole-home humidification, dehumidification, ventilation and air cleaning systems, work out an all-inclusive maintenance plan with your HVAC technician. Each HVAC system can enhance or degrade the operation of another.
Preventive maintenance begins with a look at previous summer cooling bills and questions about maintenance history, performance and any current issues, such as uneven cooling. Next, the thermostat is tested in all modes. If you’re still using a manual or digital thermostat, expect to hear about the many benefits of upgrading to a programmable thermostat for carefree savings and comfort.
The technician walks through the home and checks airflow at each supply register to check pressure and balance. Unbalanced airflow can indicates duct problems. Return grills are removed and air filters are checked and cleaned or replaced.
If you’re using disposable fiberglass filters, expect another talk about the benefits of upgrading to a high-efficiency pleated filter to better protect HVAC components, air ducts and indoor air quality. (Pleated filters are a modest investment that promotes greater HVAC efficiency.)
Following are basic A/C preventive maintenance checks performed:
- Blower motor ports are lubricated, if applicable to your blower motor.
- The evaporator coil, fins, drip pans and drain line are thoroughly cleaned. HVAC components can be a haven for mold and mildew growth.
- The outdoor condenser coil and blower are cleaned.
- Refrigerant charge is checked. If it’s low, leak detection measures are performed.
- Electrical contacts are checked for tightness and wear.