Yes, a dirty air filter can prevent your AC from turning on by restricting airflow, which causes the system to overheat and activate a safety shutoff mechanism. This protective measure prevents damage to the unit but results in it not operating until the issue is resolved. Regularly replacing air filters, ideally every 1-3 months, ensures adequate airflow and efficient system performance. A clogged filter not only hinders the AC from turning on but also reduces overall cooling efficiency and increases energy consumption. If your AC has been shutting down frequently, inspect the filter first and replace it if it’s dirty or clogged. Maintaining clean filters is a simple yet crucial step in ensuring the longevity and reliability of your air conditioning system.