Worked example with assumed numbers. Not a customer.
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HVAC · Worked Example

HVAC Team

An assumed 3-person HVAC company that gets 20 calls on a normal day, with one office coordinator answering the phone. Heat-wave weeks run higher; this example uses a normal month.

$5,736
Example Monthly Gain, After VoiceCharm's Cost
35%
Assumed Missed Call Rate
20
Assumed Calls Per Day
$193/mo
50¢ a minute, billed by the second, no monthly fee

Every number on this page is an assumption we chose, then arithmetic. None of it was measured from a customer. Change the inputs and the result changes with them.

Industry Context

HVAC demand is seasonal. When a heat wave hits, calls arrive faster than one coordinator can answer them, and a caller with no cooling is the least willing to wait. The numbers below are assumptions for a normal month, not measurements. A surge month would mean more missed calls, and VoiceCharm's cost would rise with the minutes.

Extreme weather brings more HVAC calls at the same time
A caller with no cooling in a heat wave is unlikely to wait on voicemail
One coordinator can be on one call at a time
VoiceCharm bills 50¢ a minute, so a busy month costs more and a quiet one less

The Problem

One office coordinator answers the phone. On a normal day some calls are missed while she is on another line; in a heat wave, more are. A caller who reaches voicemail can try another company. In this example 154 calls a month go unanswered.

What VoiceCharm Does Here

  • Answers several calls at once — no busy signal during surges
  • Asks whether the caller is without heating or cooling and emails you their name, number, address and answer the moment the call ends
  • Marks the email URGENT when the call is urgent
  • With Google Calendar booking turned on, books routine maintenance into the next open slot
Features in This Example
Concurrent Call HandlingEmailed Lead BriefUrgent FlagOptional Calendar BookingCall Overflow

Before & After in This Example

Without VoiceCharm

Missed calls reaching voicemail154/mo
Revenue at risk/month$59,290
Calls answered at onceOne
Lead details after a missed callNone
Staffing during peaksStretched

With VoiceCharm

Missed calls reaching voicemail0 (forwarded to the AI)
Revenue recovered/month+$5,929
Calls answered at onceSeveral
Lead details after a missed callEmailed after each call
VoiceCharm cost$193/mo

ROI Calculation

Assumptions

Calls per day20
Current missed call rate35%
Assumed job value$700
Working days per month22
Share of answered calls that become a job55%
Share of at-risk revenue won back10%
VoiceCharm pricing50¢ a minute, billed by the second, no monthly fee
VoiceCharm monthly cost$193/mo

What the Arithmetic Gives

Missed calls per month154 calls
Revenue at risk$59,290
Assumed won back$5,929 (10% of that)
Monthly gain$5,736 after VoiceCharm's $193
Twelve months of that$68,832
PaybackOne $700 job covers the month

Cumulative Gain in This Example

Month 1
Without VC
$0
With VC
+$5,736
Month 3
Without VC
$0
With VC
+$17,208
Month 6
Without VC
$0
With VC
+$34,416
Month 12
Without VC
$0
With VC
+$68,832

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