Why do I feel uncomfortable, tired, dizzy and listless in an air-conditioned room?

This is a precursor to air conditioning disease.

Don't turn on the air conditioner for a long time and don't stay in the air-conditioned room for a long time.

The best way is to turn on the air conditioner at the rated temperature (26-28 degrees Celsius), that is, turn off the air conditioner, let its temperature rise to unbearable, then turn it on, and so on. You won't get air conditioning disease, and your body will get used to exercise.