A: Cleaning your system is an essential part of HVAC preventative maintenance. Some components, like air filters, should be inspected and replaced every 1-3 months, depending on usage and environmental factors. Other components, such as coils and ductwork, should be cleaned at least once a year to maintain optimal performance. Scheduling annual professional maintenance with a trusted HVAC service provider will ensure all components are thoroughly cleaned and inspected, keeping your system in top shape.