Yes, a dirty air filter can significantly affect your HVAC system's performance. When the filter becomes clogged with dust and debris, it restricts airflow, causing the system to work harder to circulate air. This can lead to reduced efficiency, increased energy consumption, and potential damage to the system. Regularly replacing or cleaning the air filter, as recommended by our Rockford, Michigan HVAC experts, helps maintain optimal performance and prolongs the lifespan of your system.