Annual maintenance on two multi head mini splits, a single mini split, and two Amana s units. The systems are in great shape and running as they should here today. Adjusted the gas pressure to optimize the efficiency of the gas furnaces here today. Changed the filters and checked the refrigerant levels here today. The 4 ton multi head mini split was making a weird noise on start up so the fan blade was tightened up. The noise is gone now but the customer will keep an eye on it moving forward.