Did you assume that there is a reason hospitals are so cold? The hospitals are required to keep the cooling set actually low for safety problems! The main reason is the spread of bacteria & germs… Mold prefers warm, wet locales, then with the AC on, that is no longer a problem, then a cooling system naturally dries out the air & also keeps it colder. Mold, mildew & fungi have a harder time forming & breeding in actually cold conditions. Also, the cooling system circulates the air around a space. The stinks, dust & hair that is in the air quality is being moved all around, then it is better for a patient to breathe in, but hospitals do go one step further & have ultraviolet lights installed in the AC equipment. As the air is cycling around, the UV lights are purifying it. The air is typically fresh & clean for a lady to breathe in. Another reason for the heavy cooling is sweat prevention, not only would it be gross for a dentist to work around sweat, but not as safe. The sweat could contaminate a room or make an operating process messy. The cooling system has the patient split out in goosebumps rather than drip. Also, the AC is for the dentist too. The kicker is that hospital operating tools emit heat! So the AC has to counteract the tools, movement & stressful situation by adding a bunch of cold air in the space. So while no one prefers frigid to death on a check up, there is a superb reason for it.