Air cooler are a cheaper option than air conditionar. They work well in dry areas in humid climates they are not effective and hence can be avoided.
Air coolers need a lot of water to be filled hence this can be a big disadvantage if you do not get enough water in summers
Air cooler works simply where water is put in the cooler. The air circumlated by the pump in the cooler as water is sprinkled on the pads of the cooler. The evaporates the heat and cool air is circumlated in the room. So its working that types