Performed 3 AC Maintenance on 3 split Lennox split gas units; 3 electronic air clean cleaners clean; 3 condenser coil cleanings; 2, 3, and 5 ton units 7 years old; 2 ton unit showing low refrigerant; cleared condensation drain lines, recommend 3 energy assist kits and surge protection to protect, increase efficiency, and extend life of all 14 SEER units. Call to schedule.