I am assuming you have an LE. If thats the case, let the system do its job. If you were to turn the A/C off, it will then get hotter than your set temperature of 72. In other words, it has to be on inorder to regulate the hot & cold air to keep it at the desired temperature, in your case, 72.does your A/C light comes on when you turn climate control on ( heat, 72 degrees )? should you turn it off or let it it be.... thanks