You're A/C unit works to remove heat from the passenger area and in doing so it also removes moisture. We are most comfortable when the relative humidity is closer to 20 percent than 90 percent, therefore the A/C system expends most of its effort wringing moister out of the air. This is what air conditioning is all about - conditioning the air. It's important to check the condensation drain at the bottom of the evaporator. If you see clear water dripping from your car, when parked… it's a good thing…if it's from the evaporator.