That depends on the temperature and humidity of the outside air (the ambient temperature). Have a look at the temperature chart below and you will see the answer. For example, at a temperature of 25 C and a relative humidity of 50%, the air from a Breezair Evaporative Air Conditioner will be at 20 C, i.e. a 5 C drop. Or, at a temperature of 35 C and a relative humidity of 30%, the air from the Cooler will be 25 C, i.e. a 10 C drop.