AI Receptionist for HVAC Companies: Emergency Triage, ServiceTitan and Jobber Options, and What It Costs

AI receptionist for HVAC companies

The first 95-degree week of the summer is when an HVAC shop loses the most money on the phone. Every tech is out, the office manager is on hold with a supplier, and the calls that go to voicemail are homeowners with a dead condenser who will call the next company on Google in about a minute.

The numbers back that up. ServiceTitan's own data on 2025 residential HVAC calls from a group of its customers shows 14.1 percent of June calls came in outside business hours, against 9.8 percent in October. Invoca, a call-tracking company, reported that 27 percent of calls to home services businesses go unanswered, and CallRail's 2025 small business benchmark put home services at 14 percent missed. Whichever figure is closer to your shop, the busiest month is when you answer the smallest share.

An AI receptionist is the cheapest way to answer all of them. This playbook covers what it has to handle in an HVAC business specifically, the safety script it must get right, which option fits the software you already run, and how to roll it out without wrecking your summer.

What an HVAC AI receptionist has to handle

Most HVAC calls fall into about seven types, and the agent needs a rule for each one.

No cool or no heat is the money call. The agent should collect the address, the system type if the caller knows it, what is happening (blowing warm air, not turning on, frozen lines) and whether anyone in the home is vulnerable, then book the next available slot or flag it as urgent. Maintenance and tune-ups are easy wins: book them into your slower days and offer your maintenance plan if you have one. Replacement estimates are high value, so book a visit and never quote a system price on the phone. Existing customers asking for an ETA or job status need either a lookup in your software or a fast handoff. Billing and warranty questions get a message and a callback. Vendors, recruiters and robocalls get a polite end to the call.

The seventh type is the one that matters most: safety calls.

The gas and carbon monoxide script is not optional

Some callers will say they smell gas or their carbon monoxide alarm is going off. An AI receptionist that tries to book them for Thursday is a liability. Your agent needs a fixed script that it follows word for word and never improvises around.

For gas, the official guidance is consistent. Connecticut's utility regulator, for example, tells people who smell a strong gas odor to leave immediately and get others out, not to flip light switches or use a phone inside, and to call the gas company or 911 from somewhere away from the smell. For carbon monoxide, the US Consumer Product Safety Commission says to get outside to fresh air immediately and then call 911.

So the instruction in your prompt should be close to this: "If the caller mentions a gas smell, a carbon monoxide alarm, or anyone feeling dizzy, sick or faint, stop gathering details. Tell them to leave the building now, not to use light switches, and to call 911 or their gas utility once they are outside. Then transfer the call to the on-call number." Test this exact scenario before anything else, and test it again every time you change the prompt.

Your options depend on your field service software

The biggest practical constraint for an HVAC shop is not the AI. It is whether the AI can see your schedule and book into it.

ServiceTitan

ServiceTitan sells its own AI Voice Agent as part of its Pro offering. According to ServiceTitan, it answers inbound calls, books jobs against live availability, books recurring maintenance for members, reschedules appointments and transfers to a live CSR when needed. Pricing is by quote only. ServiceTitan has published customer stories, including one from Bill Joplin's Air Conditioning and Heating headlined as booking over 90 percent of calls; treat that as a vendor case study, not an independent result.

ServiceTitan is strict about integrations. Its help center says third parties can connect only as certified apps from its marketplace, or as customer-built apps on its top packages, and sharing your app key with a third party is prohibited. In practice that means a ServiceTitan shop should look at the built-in agent or at certified HVAC specialists. Avoca and Sameday both list ServiceTitan certified integrations and sell AI call answering and booking for home services. Neither publishes prices.

Housecall Pro

Housecall Pro sells CSR AI as an add-on. Its help center says it answers calls in real time, handles common questions and summarizes each call, and that owners can allow it to book, reschedule or cancel. The add-on price is not published, so you will need a demo. Full API access is on the Max plan, listed at $299 a month billed annually as of October 2026, which also makes a DIY build possible.

Jobber

Jobber's Receptionist answers calls and texts around the clock, books visits using your existing online booking settings, texts back callers who hang up, and escalates urgent calls by keyword. As of October 2026 it is a $29 monthly add-on with 30 conversations included and $0.79 per extra conversation, and it is included on the Plus plan. For a small Jobber shop, this is the obvious first thing to try.

Google Calendar, a spreadsheet, or nothing

If your schedule lives in Google Calendar or a whiteboard, a DIY build on a voice platform is open to you. One builder documented on this site walks through a full HVAC receptionist on Retell AI with n8n, Make and Twilio that handles new customer intake, emergencies and transfers, and says production systems were tested on 100 to 200 live calls per deployment (builtwithagents.ai/strategy/ai-voice-receptionist-hvac-retell-ai-full-build). Another documents a single OpenClaw agent running an HVAC company's phones for 30 days at about 15 cents per minute of call time (builtwithagents.ai/strategy/openclaw-hvac-phone-system-30-day-test). Both are builder-reported, and both are good blueprints.

A worked example: a six-truck shop in July

Take a six-truck residential HVAC shop that gets about 900 calls in July, averaging 3 minutes each. These are illustrative numbers, not a documented client. If the shop sends only after-hours calls and daytime overflow (anything unanswered after four rings) to the AI, that might be 300 calls, or about 900 minutes.

On a DIY Retell build, Retell's published rates come to about $0.11 a minute for the voice engine, voice and model in its own example, plus $0.015 a minute for telephony, as of October 2026. Call it $0.125 a minute, or about $113 for the month. On Vapi, the platform fee is $0.05 a minute with the speech, model and voice providers billed at cost on top, which lands in a similar range.

On Jobber's add-on, 300 conversations would be $29 plus 270 extra at $0.79, or about $242. On ServiceTitan, Housecall Pro or a specialist vendor, you will get a quote.

Now the other side. If the AI books just two no-cool calls that would otherwise have gone to a competitor, it has very likely covered its cost for the month at any of these prices. What it costs you is the setup time and the review time, which the steps below keep small.

How to set it up

Step 1: Pull last summer's call log

Export June through August call records from your phone system or call tracking tool. Count total calls, missed calls, after-hours calls and average length. Then listen to 20 recorded calls, or read 20 call notes, and tag each one with the seven call types above. This tells you what the agent has to be good at, and it gives you real phrases to put in the prompt.

Step 2: Write your triage rules on one page

Write down your service area by zip code, what counts as an emergency (no cool above a certain outdoor temperature, no heat below one, elderly or infant in the home), your after-hours fee policy, and whether the agent may state your published diagnostic fee. Add the gas and carbon monoxide script word for word. This page becomes the core of the prompt, whichever product you use.

Step 3: Pick the option that matches your software

Use the table above. ServiceTitan shops should start with ServiceTitan's agent or a certified specialist. Jobber shops should switch on Jobber Receptionist. Housecall Pro shops should get a CSR AI quote and compare it with a DIY build if they are on Max. Everyone else can build on Retell or Vapi, or try an off-the-shelf product first.

Step 4: Start with after-hours and overflow only

Do not hand the agent your whole phone line on day one. Set your phone system so calls go to the AI after hours and when nobody picks up within a set number of rings. Most business phone systems have a ring group or overflow setting for this, and most carriers offer conditional call forwarding on no answer or busy.

Step 5: Test with 20 scripted calls

Before going live, call it yourself with a script: a no-cool call in a heat wave, a gas smell, a carbon monoxide alarm, a caller outside your service area, someone asking what a new system costs, an angry customer whose tech never showed, a vendor pitch, and a caller who gives a hard-to-spell street name. The HVAC Retell build mentioned above uses a simulated testing tool that generates test personas for the same reason. Fix the prompt and repeat until it passes all of them.

Step 6: Read every transcript for two weeks

For the first two weeks, read every call. Look for wrong addresses, booked slots you cannot fill, promises you would not make ("a tech will be there in an hour") and calls where the caller hung up mid-conversation. Name and number capture is a common weak spot: a veterinary clinic build on this site reported about 60 percent accuracy in early testing, with names and phone numbers among the known problems. After two weeks, drop to a weekly review.

What this costs

As of October 2026: Jobber Receptionist is $29 a month plus $0.79 per conversation after 30, or included on Plus. ServiceTitan's AI Voice Agent, Housecall Pro's CSR AI, Avoca and Sameday are quote only. A DIY build on Retell runs about $0.11 a minute plus $0.015 telephony and $2 a month per number. Vapi charges $0.05 a minute plus provider costs. An agency build typically carries a setup fee and a monthly retainer; builders on this site report setup fees from a few hundred dollars to several thousand. For a wider price comparison across off-the-shelf receptionists and human answering services, see our guide to AI receptionist cost.

Where HVAC AI receptionists go wrong

Pricing replacements. A homeowner asking what a new system costs should get a booked estimate visit, never a number. Put that rule in writing.

Overbooking a heat wave. If the agent can see open slots but not your real capacity, it will fill tomorrow with 15 no-cool calls that your six trucks cannot reach. Block capacity in your schedule, or have the agent book a callback window instead of a fixed time during peak weeks.

Members and existing customers. Your maintenance plan members expect priority. If the agent cannot look them up, have it ask whether they are a member and flag those calls.

Promises about arrival times. Dispatch decisions should stay with your dispatcher. The agent can say when the appointment window is. It should not promise a tech within the hour.

If your office already answers almost every call, even in July, and your customers are mostly long-term members who will leave a voicemail, the case for an AI receptionist is weak. Spend the money on another CSR shift in peak season instead.

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