Ok, after reading all the replies I think I have it figured out. The pause must have been as short as 1-2 seconds, remembering events of a week ago gets harder with age ;) I had the fan on auto both times at start up so it must have been the fan speed adjusting. I'll just keep it on low fan when running AC. The temp really was 67 that morning, I have two thermometers (one digital) and they both read 67 so I guess the thermostat is not very accurate. Thanks for all the replies, I guess I'll just wait until the DW complains and replace it then.