No, evaporative coolers do not cause mold. Evaporative coolers use the natural process of evaporation to cool the air, which does not create an environment conducive to mold growth. However, evaporative coolers can cause an increase in humidity levels, which can lead to mold growth if the humidity is not properly managed. To prevent mold growth, it is important to keep the humidity levels in the home below 50%. Additionally, it is important to regularly clean and maintain the evaporative cooler to ensure it is functioning properly.