Several years ago I waited until the first hot day of summer to turn on my AC. This is how I found out about one of the busiest times for repairmen and had to sweat for two weeks. Now I do a test run a couple of weeks before it heats up. Same goes for the furnace at the end of Autumn.
The people that installed my new HVAC this time last year called me just this morning … do you work for them?