The simple fact is that air conditioners make noise. AC units contain fans and it is next to impossible to run a fan without making at least some sound.
Generally speaking, AC units will emit a low “hum” when pumping air into the ductwork. You may also hear a clicking sound when the thermostat turns the AC unit on or off.
But, if the noise level is high, or the sounds are strange, unpleasant, and/or disruptive, you may be in need of air conditioning repair in Irving TX.