The math nobody runs
Miss a handful of calls a week during the summer run, at a typical service ticket, and that adds up to real money over a year, money that never appears as a loss anywhere in your books. A missed call doesn't get logged as lost revenue. It just looks like a slightly quieter Tuesday, a technician with a gap in his schedule, a month that felt a little softer than it should have. Run the number honestly, five missed calls a week at a couple hundred dollars a ticket, and most shops are surprised by how many tens of thousands of dollars a year that quietly represents.
It compounds, too. A homeowner who can't get through during an emergency doesn't just take her business elsewhere for that one job, she remembers who answered and who didn't, and the next routine tune-up or eventual system replacement goes to whoever picked up the phone when it actually mattered.
Voicemail is not a strategy
A homeowner with no air conditioning in July isn't going to sit around waiting for a callback. She's going to call the next name on Google or the next truck she sees on the highway, and a lot of callers never even leave a voicemail in the first place, they just hang up and dial the next number. Home services callers in an emergency are notoriously quick to bail on a voicemail greeting.
The first shop to say "yes, this afternoon works" usually wins the job. It's rarely the shop the caller phoned first, and it's almost never the shop that answered with a recording asking her to leave a message after the tone.
Where the leak actually happens
It's rarely the calls your office handles comfortably during business hours. The leak is in the hours outside the 8-to-5 window, the second call that rings in while your CSR is already on another line, and the calls that roll to a generic after-hours greeting nobody actually listens to until Monday morning.
This is also exactly the moment a shop can least afford to be short-staffed, because the worst week to be thin on the phones is the week every other shop in your market is thin too. A heat wave doesn't ask your office to work through lunch, it just happens, and whichever shop has the capacity to answer the fourth simultaneous call is the one that gets the job. An audit puts a real, specific number on what that's costing your shop, at your call volume and your ticket size, instead of a rule of thumb borrowed from an industry survey.