Changing your filters is a great habit, but it’s only one small part of a much larger picture. One of the biggest maintenance myths is that DIY is enough to keep your system running smoothly. While it’s tempting to save money by skipping the pros, most homeowners don’t have the tools, experience, or training to spot hidden issues that can spiral into serious repairs.
What professionals check during a seasonal HVAC tune-up:
- Refrigerant pressure and levels (critical for efficient cooling)
- Electrical connections and voltage tests to prevent hazards
- Ductwork and airflow inspection to catch blockages or leaks
- Thermostat calibration to ensure your system responds properly
- Mechanical wear on belts, motors, and fans that DIYers can’t easily assess
Cleaning or replacing filters is helpful—and important—but it doesn’t prevent refrigerant issues, electrical failures, or airflow restrictions. Think of it as brushing your teeth: great daily care, but not a replacement for a full checkup.