A few of the 47 items we will check on your system
In His Head
Expert training. He knows more about your compressor than he does his wife.
In His Truck
Enough parts to rebuild your system, so he can make any needed repairs on the spot without needing a return visit.
Background
He has a clear background check and is drug-free. He won't be cursing around you, either. His mother is so proud.
On His Wrist
A watch. He responds to calls in hours, not days. He'll even come out in the evening and on Saturday.
On His Shoes
Slip-on shoe covers so that nothing gets tracked inside your house. He knows you just vacuumed.
In His Hand
Clipboard with everything about your situation and your AC system, plus room for notes so that any future technicians will be up to speed on the next visit.
On average your air conditioning unit runs 3,100 hours per year
If it were a vehicle traveling 50 miles per hour it would circle the earth 6.22 timer per year or travel to the sun every year and a half
ACs were originally invented to dry ink by Willis Carrier. He successfully developed a system to regulate humidity and marketed it under the name "apparatus for treating air"