Warm air from vents often points to low refrigerant, dirty coils, or a compressor issue

https://localairconditioningcooling083.talesignal.com/posts/how-to-tell-if-your-air-conditioner-needs-one-more-repair-or-a-full-replacement

Warm air from vents often points to low refrigerant, dirty coils, or a compressor issue. Turn the system off and call a licensed HVAC technician for inspection.