Question: how much water does evaporative cooling use?
Answer: Most water use estimates range from 3 to 15 gallons / 11 to 57 litres per hour, with averages between 7 and 11 gallons / 26.5 and 40 litres. But the amount of water an evaporative cooler will use varies depending on three major factors: 1. The combination of heat and humidity at any given time.