The answer to 'air handler blowing hot air' is that the air handler is likely not functioning properly and is blowing hot air instead of cool air. This can be caused by a few common issues, such as a refrigerant leak, a problem with the thermostat, or a malfunctioning compressor.
If your air handler is blowing hot air, the first thing to check is the thermostat. Make sure it is set to 'cool' and that the temperature setting is lower than the current room temperature. If the thermostat is working properly, the issue may be with the refrigerant level or the compressor. A refrigerant leak can cause the air handler to blow hot air, and a malfunctioning compressor can also lead to this problem. In some cases, the air handler itself may need to be repaired or replaced.