The first three are on your P&L: what a service call bills, what a full changeout brings in, and what a maintenance agreement is worth across the years a customer keeps renewing. HVAC is unusual in that all three arrive down the same phone line — and the third is worth far more than it looks on the day it is sold, because a plan member is a customer who calls you first for a decade and buys their replacement system from you when the time comes.
The number you have never counted is the rush-week gap. Take your busiest week last summer. Pull the call log — total inbound versus calls actually connected. Most owners who do this for the first time are unpleasantly surprised, because during a rush the misses do not feel like misses; they feel like a week where everyone was flat out.
Now price that gap honestly. Those callers had a failed system in a heatwave. Every one of them bought something from somebody within about a day, and a meaningful share of them bought a system rather than a repair.
Then do the quieter version for the shoulder months: how many maintenance agreement conversations did not happen because a Saturday call went to voicemail? That one compounds, which is why it is worth more than the rush arithmetic even though it feels like less.
There is published research on response speed worth knowing, and worth handling carefully. Harvard Business Review's audit of 2,241 U.S. companies found 23% never responded to an inbound enquiry at all, and among those that did respond within 30 days the average took 42 hours; a separate study of 1.25 million leads found firms contacting within an hour were nearly seven times as likely to reach a decision maker as those waiting an hour longer. That work is about web enquiries and outbound follow-up, not about answering a ringing phone, and none of it is HVAC-specific — so treat it as general evidence that speed decides outcomes, not as a number about your trade. In a heatwave your window is a good deal shorter than an hour.
Against that, answering is billed by the second Megan is talking. The shoulder months are quiet and therefore cheap. The rush costs more, because the rush is when the phone is producing revenue. That shape is the exact inverse of hiring, where the seasonal peak is when a fixed headcount is hardest to justify and impossible to find.
Pay As You Go is $29 a month plus $0.88 for each minute Megan spends on calls, with no included minutes. Professional is $199 a month and includes 500 minutes, then $0.45 a minute. Growth is $499 a month and includes 1,500 minutes, then $0.38 a minute. Enterprise is priced by conversation. Every plan includes the entire product — the plans differ by included minutes only — and calls are billed in real seconds, never rounded up to the next minute.