Frequently Asked QuestionsHave questions about your PMI evaporative cooler or accessory? Here you will find the answers to the most common questions about our products. If you can not find the answers you are looking for, call our toll-free number at 800-325-6952. General FAQsAre the residential motors thermally protected? Who is PMI? What is the difference between the Aerocool Trophy and the Aerocool Pro Series? Are thermostats available for evaporative coolers? What is an UP-DUX? What is evaporative cooling? How do I direct the cooled air blown into my house? Why evaporative cooling? Is there another way to exhaust the air other than leaving windows or doors open? How many windows or doors do I need to leave open? What is exhaust air? What is the difference between Aspen pads and Rigid Media pads? What choices of evaporative cooling do I have? How much energy does evaporative cooling save? How do I service my cooler?Maintenance FAQWhat should I do if the blower wheel assembly seems to be out of balance? How do I lubricate the blower assembly bearings? What do I do if the unit becomes scratched? Can soft water be used with the evaporative cooler? How many times a year should I service my cooler? Can I use cooler cleaners, cooler treatments, anodes or other additives in my evaporative cooler? Can I use the Power Cleaning System in any residential cooler? Why should I use the Power Cleaning System in place of the Bleed-Off? (Technical comparison) What is the Power Cleaning System? Is a bleed-off required and can it be restricted? What is a bleed-off?Trouble Shooting FAQWhat should I do if the blower wheel assembly seems to be out of balance? What causes noise at water supply line? What causes the motor to shut down and overheat and then come back on after cooling down? Why does my new rigid media cooler smell bad and how do I stop it from smelling? There is a smell coming from my cooler what should I do? Why is the water draining from the overflow stand pipe? Why is my cooler not cooling?Warranty FAQWhat is the CFM Rating on my cooler? What is the SEER Rating on my cooler? What is the BTU Rating of my cooler? Where is the model number located? How do I obtain service if my evaporative cooler is under Warranty? What is the warranty for my evaporative cooler?