Couple other things:
I need to fill the hole in the wall underneath the thermostat with caulk to keep the hot air in the walls from tripping out our thermostat (this I knew).
There is a slight leak in the duct in the garage where the air-handler is located letting cool air out. They are coming back to get that patched up with mastic. One other thing . . . This is a 1954 house so we have an attic fan. The opening is only 6 inches away from the air return in the hallway and is likely pulling air down out of the attic and back into the system. So, we are going to patch that up since we don't really use it anyways.
I'm blabbing - I'll stop.
Your right . . . No charge for the service call.