AeroCool Pro Series (PD4801,PD6801)-Set the comfort level for you and your family and the AeroCool Pro-Series evaporative air cooler does the rest. Combined with the Pro-Stat programmable thermostat, the AeroCool Pro-Series will automatically and efficiently operate the equipment to best maintain your comfort level while using the least amount of energy. Click here to watch a video of what is inside a Pro Series cooler: https://www.youtube.com/watch?v=eTR-7pMf1uM