Performed regularly scheduled preventative maintenance for pet supply store in Clovis CA. Store has 4 Lennox gas/electric rooftop package units with gas heat. Each unit is 15 tons. Changed all filters with MERV 8 Pleated filters. Changed Browning cogged V-belts. Inspected all motors and controls. Checked refrigerant pressures. Tested gas heat, inspected pilot, burners, and heat exchanger. No deficiencies were found. PM is complete.