This is MY pet peeve: Almost everyone around here uses a yard service for yard care. There is one neighbor whose service comes at 7 AM every Saturday morning. They have gradually started a little later, so it's closer to 7:30 now (hey - maybe in a few more years it will get to 8 AM!) We don't get humid around here; we're inland, so we don't get the summer fog like they do in San Francisco, but we don't get very hot 'til about mid-day - and that's only a few days a year. Our temperatures are moderate year-round, so I don't put up with any of that "gotta do it before it gets too hot" - that just doens't fly around here. This is the service that will mow in the winter with frost on the lawn! If they waited 'til mid-day, the frost would be gone!
We are just outside town limits, so the noise ordinances for the county are more lenient than the town ordinance. So, yeah - lawn-mowing before 8 AM on a Saturday morning bugs the heck out of me!