Does AC rob power while not in use?

I know if may AC is not on I get hot as hell and become sluggish. But the real answer is yes. You lose some power because of friction and resistance just in the pulley. But how much I don’t know. The way I look at it unless you are racing for money to make a living and you trailer it ditch the AC. But if it’s a daily keep it. AC down here is highly desirable.