The first hot week decides the season
Demand does not arrive evenly. It arrives the week the weather turns, when every unit in the county fails at once and the company that answers first books the month. A phone that rings out on that Monday is not one lost job, it is the queue.
Estimates get compared, then forgotten
A replacement system is a considered purchase, so the homeowner collects three numbers and sits on them. The quote that gets a polite follow-up is the one still in mind a week later; the other two are in a drawer.
Maintenance is the part nobody chases
The customer whose unit you serviced two years ago is the cheapest work available and the easiest to forget. Nothing in a notebook reminds anyone that they are due.