Performed A/C tune-up on 3 Trane High Efficiency Systems and 1 Carrier Infinity System. Checked the electrical, mechanical and performance systems of the units. Cleared, cleaned, flushed and treated the drain lines and replaced all return air filters. Cleaned the exterior of the furnaces and washed all outdoor coils. I also washed all mini split filters at no additional cost. I did find two indoor split systems in the back building are dirty. I also found some rodents have chewed through some ductwork especially in the master bedroom ducting. The cold air in the duct is mixing with the hot attic air and is sweating. The water is dripping through the supply register in the master bedroom closet. No other issues were found. All systems are operational at this time.