Have you had this happen to your cooler? There are three main reasons that your cooler may be freezing up. (1) Plugged Filters: Make sure you have your filters changed regularly. (2) Supply Registers Shut: You may have several supply registers in your home that are shut, make sure they are all opened to allow better air flow. (3) Blower Motor: The unit's blower motor may not be running properly which means it is in need of service. NOTE: If you find that your cooler as a lot of ice building up on the outside of it then it is important to call a service technician out to get your unit checked and back to functioning properly!