PRODUCT GUIDE Evaporative Coolers Behind the recommendations Related articles Behind the recommendations Related articles Evaporative Coolers Units with saturation effectiveness of 80+% under all operating conditions and a mechanism for cleaning with minimal water use More about Evaporative Coolers Evaporative Coolers Coolerado: Evaporative Cooling Without Added Humidity Dry-Bulb? Wet-Bulb? What's the Difference? Dry-bulb and wet-bulb thermometers measure two different types of heat. Understanding them is crucial to understanding building science.