Routine maintenance is absolutely essential for getting the best performance and the longest service life from your evaporative cooler. Most manufacturers recommend getting professional evaporative cooler service every 6 months. This service includes draining and cleaning the unit to help prevent issues with mold or mildew odors. We will also inspect all vital parts like the float valve, pump, belts, and pads, and let you know if any repairs are needed. Then we will refill and reseal the entire unit and you should be able to enjoy 6 more months of reliable operation. More Visit: http://www.uscomfort.com/ 800-738-4160