Arrived in Smithville for AC Repair, Upon my arrival I performed my diagnostics on system #1 to find the cause of the unit freezing over. I found that the system was low on refrigerant. Spoke with the customer about what I found and went over adding refrigerant back to the system. Customer approved to have the system recalibrated to the manufacturer specifications on the refrigerant charge. I added 3lbs of R410a to the system to bring it back to proper performance standards. After completing this I verified the systems operation and found it to be performing very well at this time. Customer would like the office to reach out and set up a leak search and go over the pricing of the leak search.