If your AC is blowing warm air, it could be due to several reasons. A common issue is low refrigerant levels, often caused by leaks. Dirty air filters can restrict airflow, leading to inadequate cooling. Problems with the thermostat setting or a malfunctioning thermostat can also result in warm air. Additionally, issues with the compressor or a tripped circuit breaker might be the culprit. Regular maintenance and timely inspections can help identify and fix these problems, ensuring your AC operates efficiently.