Annual maintenance discussion on your comfort unit besides changing the air filters every month.
For the cool part, the coils need to be clean. Electrical parts and connection inspected.
Discussion of extended warranties. Are they needed based on the manufacturing warranty.
Annual maintenance on a mini split system. Keeping the outside unit clean for starters.
Keeping pets away from peeing or chewing wires on a unit.
Multi zone system is the other name for a mini split system. Very efficient system for cooling for a single room, garage or sunroom.