Swamp coolers are examples of evaporation heaters. They are popular in hot, dry climates because they throw cool, moist air through a house. Swamp coolers are not complicated pieces of machinery: they are essentially fans that blow air through pads soaked with water. There are several steps that you can take to help make sure that your swamp cooler is throwing the coldest air that it can.
Position the swamp cooler on a shady side of your house if possible. If not, erect a tent or other structure to block the sun. A swamp cooler with colder water will naturally throw colder air.
Open a window on the opposite side of your house from the swamp cooler. This will create a cross breeze through your house that is essential to the cooler's proper operation.
Ensure that the cooling pads are free of dirt, mold or crusted foam. All of these will reduce the swamp cooler's efficiency, thereby reducing how cold it can get. If the pads are bad, replace them.
Keep the swamp cooler filled with water to the proper level. If it is not filling properly, increase the water flow.
Turn on the internal water pump for ten minutes to completely saturate the cooling pads before turning on the fan. This will make the cooler begin blowing cold air right away, rather than gradually as the pads soak.