I don’t know what Doctors say about them i.e. about AC and Air Cooler in the case of human health. All I know is my personal experience. However I have been asking many people such as friends and family about he difference between Ac and air cooler and the answer was the same as i expected.
Air Conditioner is indeed a rich craze and nothing else. No doubt there are times when it’s needed and inevitable such as in Case of Heart Attack a patient needs Air Conditioned room immediately. Likewise there are times when Ac is the best and better option for human health but not always. In normal life Air Conditioner is more than harmful for humans.
Instead the Air Cooler is nothing but a cool air thrower and that air is cooled naturally i.e. in air cooler we use water stream for cooling the air. Air Cooler’s fan blow the air inside the room and the tank of water in water cooler runs by a motor pump which flows water upstream and then throws it onto the walls. All walls of an air cooler have grills and dry sward on them. Dry sward gets wet with water and hollow of an air cooler i.e. the inside space of an air cooler gets cooled. Thus when the fan blows air into the room, rooms gets cooled. It is obviously a natural cooling system. It’s purely natural way.
While An Air Conditioner sucks air from the air. That air cools those little pipes of brass (usually) in which a gas runs. This gas is generally called Freon Gas. Wikipedia writes about Freon Gas,
A chlorofluorocarbon (CFC) is an organic compound that contains only carbon, chlorine, hydrogen and fluorine, produced as a volatile derivative of methane and ethane. They are also commonly known by the DuPont brand name Freon. The most common representative is dichlorodifluoromethane (R-12 or Freon-12). Many CFCs have been widely used as refrigerants, propellants (in aerosol applications), and solvents. The manufacture of such compounds has been phased out (and replaced with products such as R-410A) by the Montreal Protocol because they contribute to ozone depletion in the upper atmosphere.
Ac works like refrigerators. Freon gas does a very marvelous job by nature. It has a quality of sucking heat from the environment. When we put something in the refrigerator, The Freon Gas suck the heat of those items which we have put in the refrigerator like food stuff etc. Everything is always a little hot due to the temperature of atmosphere. Freon suck their temperature and get itself melted into liquid form due to the temperature. Try to understand this phenomena with an example,
Say you have put the mangoes in your refrigerator. You will find them after an our that they are cold now. What happened to them indeed? Actually Freon gas in the brass pipes of the refrigerator sucked the heat of mangoes because this gas sucks heats always from the atmosphere. You can see this is not a natural way of keeping your food cold. No doubt when we need to preserve something organic we need to make it cold like ice. Thus organic things does not decompose and they are preserved for long time. So in the case of refrigerator it’s not much bad that we place our foods in them. Although it’s not natural but it’ll still work for the preservation of food. By the way by new knowledge it’s said that do not eat a food which has been kept in the refrigerators more than 24 hours.
But in the case of AC it’s not good enough. When we are sitting inside an AC room actually we are like a food item of the refrigerator without any slit difference. You know we make our room air tight before we switch on the AC like we have the inner atmosphere in our refrigerators. This is absolutely unnatural.
Also when you are sitting or sleeping in an AC room you are not breathing the fresh air at all. The Freon Gas is sucking the heat from your room’s atmosphere and the rest is cold. Now, when you breath you inhale not cold air but cold atmosphere. You should have inhaled the heat of the air. It’s more than necessary for your health. You are well aware that we do not need to inhale cool or cold air in summer for keeping us from the hot. No! this is not the way. We just need to keep ourselves from hot summer and sunny day for maintaining our body temperature because our bodies feel hot weather and not the lungs. Our lungs still need the same air with a little heat in it. All an Air Conditioner does is to suck our necessary heat from our natural environment.
So definitely an Air Cooler should be the best option for human health. AC does naturally whatever it does.