Example: a 12-truck HVAC company in a summer heat wave

The business in this example

Dry Creek Heating & Air is a fictional company built to show how the call handling and the numbers would work. It runs twelve service trucks in a hot, fast-growing metro, with fourteen technicians, three customer service reps, one dispatcher, a service manager and the owner. In a normal summer week the office fields about 110 calls a weekday. On heat-wave days in this example that roughly doubles, and most of the extra calls land between 3 pm and 7 pm, when upstairs bedrooms climb past 85 degrees and people get home to a warm house.

Demand like that comes with the trade. In EIA's 2020 survey, 88% of US households used air conditioning and two-thirds relied on central AC or a central heat pump^[2], so a heat wave strains nearly every customer's system in the same week. Field crews flex for it: BLS notes that HVAC technicians may be on call for emergencies and sometimes work overtime or irregular schedules during peak heating and cooling seasons^[3]. The office has no such give. Three reps can talk to three people at a time, and everyone else waits.

The trouble in this example is that every call looks the same in the queue. Four patterns cost the company the most:

• A no-cooling call from a house with an elderly parent in it waits behind a tune-up reschedule and a thermostat question.
• Maintenance-plan members were promised priority, but a rep only learns that someone is a member after opening the account, several minutes into the call.
• Status calls asking where the technician is pull a rep away from new bookings at the busiest hour of the day.
• Callers who give up on hold leave a short voicemail or none. The morning callbacks come from the reps' direct lines, and eight in ten Americans say they don't generally answer their cellphone when an unknown number calls^[4]. Pros are hard to find as it is: 53% of homeowners in Angi's 2025 State of Home Spending report said they had difficulty finding them^[5]. A caller who reaches voicemail in a heat wave keeps dialing down the list.

Advertising adds another cost. The company buys Local Services Ads in this example, and Google lists a provider's responsiveness among the factors behind ad ranking, adding that missed calls may count against it^[6]. The afternoons when the phones are most overloaded are the same afternoons when that ranking matters most.

How the calls would be sorted

In the modelled setup the office phone system forwards any call the reps cannot reach within three rings, and every call after 6 pm, to an SI Employee. It does not replace the reps. It takes the overflow and the evening calls so the reps can spend a heat wave on the conversations that need a person. Before go-live the owner and service manager would write the triage rules on a single page. In this example they read like this:

1. Priority one, same day, transferred to the dispatch line, which rolls to the on-call tech's cell after 6 pm: no cooling with someone at home who is 65 or older, an infant, pregnant or living with a chronic illness, groups CDC lists as at increased risk from heat^[7]; water coming through a ceiling from the air handler; or any burning smell. If nobody picks up, the call comes back and the details go to dispatch as an urgent message.
2. Priority two, next open repair slot: no cooling in a household with none of those risks.
3. Priority three, booked within three days: weak cooling, noise, short cycling or an unresponsive thermostat, after the caller has checked the filter and the breaker.
4. Routine, booked after the peak: cooling tune-ups, second opinions and replacement estimates, with plan members noted as members on the booking.
5. Status calls: an urgent message to dispatch with the customer's name and address, and a promise of a call back within 30 minutes. Nobody guesses an arrival time.

Membership is checked as the call connects. In this example the company's field-service software has an API, so the owner sets up a lookup that runs on the caller's number and returns plan status and equipment age; a caller on a different phone can be looked up by service address. Every booking is stored in AssistCall with the call's recording, transcript and summary, and a webhook can pass it on to the company's other tools. The dispatcher keeps working from the board and stays in charge of who goes where.

On the first heat-wave afternoon the service manager would watch from the live call list, listening in and taking over any call that starts to drift. That is where the rules get tested against real customers, and where a sentence such as 'it's running but not cooling' gets sorted into the right priority for next time.

What the numbers would look like

The worked example below models the office time the SI Employee would absorb on weekdays in a peak month. The hourly figure is what private employers paid per hour worked for office and administrative support staff in June 2026, wages and benefits together^[1]. The call count, call length and the share handled start to finish are invented for this example.

In this example that comes to about 95 hours a month, a little over half of one full-time rep's working month, or roughly $3,500 of office time at the BLS rate. The usual alternative is a seasonal hire, and SHRM's 2022 benchmarking data put the average cost per hire at nearly $4,700^[8], before anyone has learned the price book, the membership terms or the service area. A rep hired in June would still be learning the board when the heat breaks in September.

Example: the office hours are the smaller number. The bigger one is the no-cooling call on a 16-year-old system that rolls to voicemail at 5 pm, because a call like that can turn into a replacement quote. The 2023 American Housing Survey put homeowners' median spend on an HVAC project at $5,500 for 2021 to 2023^[9]. Lose two of those a week to a competitor and that is about $47,600 of work a month at the median, against roughly $3,500 of modelled office time.

The first 30 days in this example

Timing matters as much as the rules. ENERGY STAR notes that contractors get busy once summer comes and recommends checking cooling systems in spring^[10]. In this example the owner would go live in April, while the phones are quiet, members are booking their spring tune-ups and the reps have time to listen to recordings.

In week one the service manager would listen to ten calls a day and keep a running list of anything handled differently from how a good rep would handle it. Typical entries in a scenario like this: a landlord calling about a tenant's unit, a caller who wants a replacement price over the phone, or a homeowner who describes ice on the refrigerant line. Each becomes a sentence in the rules rather than a retraining project.

By the first heat wave in this example, the spring tune-ups are done, the rules have been through a month of real calls, and the reps have heard enough recordings to trust the summaries. That is what lets July be about repairs instead of rescheduling.

Lessons from the scenario

• Write the triage rules before summer, and write them as who is at home and what is happening, not as a feel for urgency.
• Make member priority something dispatch can act on: plan status on every booking and summary, not buried in an account screen.
• Send the overflow and the evening calls to the setup so the reps keep the conversations that need judgment.
• Never let anyone, person or software, guess an arrival time; route status calls to the dispatcher.
• Judge the setup on first-call bookings and the length of the morning callback list, not on calls answered.

Several things would not change in this example: the company number, its prices, its technicians and the dispatcher's authority over the board. A caller who asks for a person is transferred to the office line, and if nobody picks up, the caller's details go to the reps as a message for a call back.

The same pattern carries over to electrical, plumbing and other trades. For trade-specific setups, see call handling for HVAC and other home service trades, and the plumbing after-hours example shows the night-time version of the same rules.