This is the most important area that beats the air conditioner in. Proper ventilation is vital in order for evaporative air coolers work efficiently. To cool the space an evaporative air cooler can draw hot, dry air from the air. The fan system as well as the moist cooling pads work together to draw in dry, hot air. The hot air is pushed through the cooling pads which are always kept in a state of constant moisture through the pump system.