I had Johnny come over to fix my A/C unit after the thermostat reported a problem. When he came over, he discovered that there was no problem with the unit and just needed a filter change. He was very knowledgeable and gave good advice about caring for the A/C unit.
Since there was no problem with the A/C unit (and he was already nearby), he didn't charge me for the visit. I am definitely going to use him for all of my future climate control needs. It is always a pleasure working with honest craftsmen.