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$200K–$1M TYPICAL ANNUAL LEAKAGE·14-DAY INSTALL PER AGENT·NO SOFTWARE CHANGES REQUIRED TO START·SIX AGENTS · 12 TRADES·BILINGUAL EN/ES BUILT INTO RECEPTIONIST·INDUSTRY-BENCHMARKED METHODOLOGY·$200K–$1M TYPICAL ANNUAL LEAKAGE·14-DAY INSTALL PER AGENT·NO SOFTWARE CHANGES REQUIRED TO START·SIX AGENTS · 12 TRADES·BILINGUAL EN/ES BUILT INTO RECEPTIONIST·INDUSTRY-BENCHMARKED METHODOLOGY·
Stack6.ai
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LEAK / 01 — MISSED CALLSMissed-Call Audit

Your shop is losing $3,400–$28,000/month to missed calls.

The math is brutal. The fix takes 14 days. The free Leak Audit shows you your exact number — built from your own call volume, ticket size, and close rate. No mock data.

Calculate my leak →Or see the agent that fixes it
Cancel anytime30 days noticeNo early-termination feesYour data, your numbers
01The math

How a $3M HVAC shop loses $18,400/month without realizing it.

Here's the math for a typical $3M HVAC shop. Every input is industry-benchmarked. The free Leak Audit runs the same calculation against your actual numbers — no mock data.

Input 1 / Call volume
400 calls/mo

Total inbound calls to the main shop number — emergency line + scheduling line. Typical for a $3M HVAC shop with 7 techs and 1 dispatcher.

Input 2 / Missed-call rate
25%

Calls that hit voicemail or rang past the dispatcher's pickup window. Industry median for 5–15 tech residential shops sits between 20% and 40%.

Input 3 / Avg ticket on a booked call
$800

Average booked-job ticket for residential HVAC service + repair (excluding system replacements, which pull the avg way up). Industry benchmark from the methodology page.

Input 4 / Booking rate when answered
23%

Percentage of inbound calls that become a booked job when answered live. Drops to ~3% when the call hits voicemail instead (MIT/InsideSales Lead Response Management Study).

The calculation
400 calls/mo × 25% missed-rate = 100 missed calls/mo
100 missed calls × 23% booking rate = 23 lost bookings/mo
23 lost bookings × $800 avg ticket = $18,400/mo lost
Annualized
$220,800/yr

In missed-call revenue, for a single $3M HVAC shop. Stack6 Receptionist installs in 14 days at $2,500 setup + $349/mo. Year-one payback: ~6 calls worth of recovered revenue.

02What the math doesn't capture

The leak compounds beyond direct revenue.

Indirect 1

Review fallout

Missed calls are the #1 cited reason for 1-star reviews in residential service. "Called three times, no answer" appears in ~14% of negative reviews across HVAC and plumbing shops with under 4.5-star ratings. That drops your Local Pack ranking and shrinks the top-of-funnel further.

Indirect 2

Ad waste

If you spend $3–8K/mo on Google LSAs or Local Service Ads, every missed call from a paid lead is direct CPL waste. A 23% missed-call rate means you paid Google for ~25% of your leads to ring out to voicemail. Stack6 typically lifts paid-lead conversion 30–60% in month one without touching the ad spend.

Indirect 3

Lifetime value lost

A missed call isn't just one job. A first-time residential customer represents an average 2.3× lifetime value within 18 months (repeats + referrals). $890 average ticket becomes ~$2,047 in LTV. The leak math above is conservative — it counts the booking, not the multi-year revenue chain you didn't start.

03The fix

Stack6 Receptionist plugs this leak in 14 days.

A 24/7 AI phone agent that answers within one ring, qualifies the lead, and books the appointment directly to your dispatcher's calendar. Bilingual EN/ES at no extra cost. Cancel anytime with 30-day notice. Most shops are live within two weeks of the Leak Audit.

But before you buy anything: run the leak audit. It calculates the missed-call leak against your shop's actual numbers — call volume, ticket size, close rate — and shows you exactly what you'd recover. If the math doesn't work, we'll tell you on the call. We don't sell agents that don't pay for themselves.

Run the free Leak Audit →Read the full product page
04Common questions

What shops ask before running the Leak Audit.

How is this different from the regular /receptionist page?
Same agent, different on-ramp. The /receptionist page tells you what the agent is and how it works. This page calculates how much you're losing to missed calls right now — the leak math, not the product spec. If you're convinced you have a missed-call problem, start here. If you want to evaluate the product itself, start at /receptionist.
Is the leak number really 21× higher for fast responders?
Yes — the MIT/InsideSales Lead Response Management Study (replicated multiple times in residential service contexts) shows that leads contacted within 60 seconds book at 21× the rate of leads contacted at 5+ minutes. The 21× figure is for cold inbound leads specifically. Existing-customer callbacks have a smaller speed sensitivity.
What if my missed calls are mostly after-hours?
Then the leak is even larger. After-hours calls have higher emergency intent (no-cool Saturday, water leak Sunday), which means higher average ticket and higher willingness to call the next shop on Google if you don't answer. Stack6 books these specifically and routes them with the right urgency flag.
We use a human answering service. Why switch?
Human answering services average 5–8 seconds to pick up (multi-ring), don't have your service catalog, can't write to your dispatcher's calendar, and cost $1–2 per call. Stack6 averages 1.5 seconds, knows your service lines, writes directly to dispatch, and costs a flat monthly fee with no per-call charge. Math: a busy Saturday with 40 inbound calls costs ~$60 at a human service vs. $0 marginal cost on Stack6.
What's the install timeline? My phone system is messy.
Typical install is 14 days. We work with whatever phone system you have — Twilio, OpenPhone, RingCentral, Dialpad, and most VoIP forwarders. Legacy PBX systems route through a forwarding number; you don't need to change anything on your end. The Leak Audit surfaces any blockers before scoping.
What if a customer doesn't want to talk to an AI?
The agent transfers to a human (your designated person) immediately — no "are you sure?" Studies of trade-vertical AI agents specifically show ~85%+ of callers either don't notice or don't care after the first 10 seconds of conversation. The 15% who do prefer to escalate to a human, do — without friction.
Will this hurt our review score? People hate bots.
The opposite, in practice. Missing a call is the #1 driver of 1-star reviews in residential service ("called three times, no answer"). Stack6 eliminates that failure mode. The 15% who specifically prefer humans get one — the conversion to a human is fast enough that they don't notice the AI handoff in retrospect.
What's the worst case if we install this and it doesn't work?
Cancel anytime with 30-day notice. No long-term contracts. The setup fee is paid upfront, but the monthly stops billing the moment you cancel. Setup fee is non-refundable — that's how we keep the monthly low (we recover install cost over months 2–6).
How do you handle accents, kids, background noise?
The voice model is trained on residential service call patterns specifically — heavy weight on regional accents (Southern, Northeast, Midwest), kids in the background, dogs barking, work-site noise. The model has 95%+ accurate transcription in those conditions. Edge cases (severe accent + heavy noise) get routed to a human after one failed clarification.
Can we listen to actual sample calls before signing?
Yes — during the Leak Audit. We can play recordings of similar shops (with permission and PII scrubbed) so you hear exactly what the agent sounds like on a no-cool call vs. an emergency vs. a quote request. No surprises after install.

Find out what you're actually losing.

The free Leak Audit takes ~45 minutes, returns a defensible dollar number for your shop, and a 14-day install plan if the math works. No sales pressure. No long contracts. The call ends with a recommendation we'll stand by.

Run the Free Leak Audit

Or read the full Receptionist product page →