Your system could be freezing up for a variety of reasons, but the most common are dirty filters, low refrigerant, a dirty evaporator coil, and/or a faulty blower motor. Changing a filter is something homeowners take care of; however, you’ll want to call the professionals at Von Deylen Plumbing & Heating, Inc. at 419-592-4756 for other problems or if you have other questions or concerns.