Why is your air blowing hot air?

It may seem obvious, but it can happen. As you were setting the thermostat, you could have flicked the selector switch over to "heat" instead of "cool." If this happened, then the reason you feel the hot air blowing from your system is because the heat is on. Simply move the switch to the "cool" setting to start chilling out.

Check the outside unit. This is where your compressor and condenser coils are located. Make sure the outside power switch is turned on to power the compressor. Without power, the system might run from the inside air handler, but it will not cool. Also check to see if there is debris such as leaves or other items blocking the air intakes on the system. This also can prevent proper cooling. Checking for airflow restrictions around the outside unit should be a regular maintenance routine.