Rule out simple settings
- Verify Cool mode rather than Fan-only mode
- Check the temperature setting and replace a visibly dirty filter
- Wait after a recent setting change; many systems include a short protective delay
Warm air has multiple possible causes
Restricted airflow, an outdoor-unit problem, a frozen coil, controls, electrical faults, or a refrigerant-system issue can produce similar symptoms. Avoid assuming that refrigerant is the answer without a diagnosis.
Useful details for a repair request
- Whether airflow is strong but warm or weak and warm
- Whether the outdoor equipment runs
- When the problem began and whether ice, water, odor, noise, or breaker trips appeared