That's where humidification systems play a major role. Cold air just does not hold moisture like warm air does. This can lead to drying of sinus's resulting in uncomfortable irritation, difficulty sleeping and may lead to an increased susceptability in warding off common germs and bacteria. Humidifiers can and do help. By now you may be asking yourself what air conditioning has to do with humidity.
Air conditioners remove moisture content in the air by passing the warm humid air over a cold coil.
Picture a cold can of soda pop fresh from the 'fridge on a warm humid day. That's right, water droplets. They condense right out of the air which contacts the cold aluminum of the can. That's precisely what condensing units in an air conditioning system do. So there you have it.