Yes. The evaporative cooling concept will work any time you are able to achieve evaporation. The more complete the evaporation, the more effective the system will work. For areas with humidity above 80%, temperature reductions can be as high as 10 degrees. For humidity levels between 40% and 80%, temperature reductions can be as high as 20 degrees. Below 40% humidity, the temperature reductions may be as much as 35 degrees.