An HVAC business sells time from skilled people, and there are not enough of them. The US Bureau of Labor Statistics projects employment of HVAC mechanics and installers to grow 11% from 2025 to 2035, much faster than average, with about 40,600 openings a year. Meanwhile the median pay is $61,010.
So the question is not how to replace technicians. It is how to stop wasting their time and the calls that would have filled their schedule. Here is what to automate, in order.
1. Answer every call, and book it
Published missed-call figures are vendor platform data, and they disagree: Invoca reported 27% of calls to home services businesses go unanswered, while CallRail's 2025 benchmark of 1.1 million calls found 14%. CallRail also cites research that up to 85% of callers who are not answered will not call back.
Either figure means real money. Housecall Pro's own job data shows the average HVAC repair rising from $818 in 2021 to $1,205 in 2025 (vendor data, described as directional).
Answering options, from simplest to fullest:
- Text-back on missed calls, so the caller gets an instant reply with a booking link.
- An AI receptionist that answers, qualifies and books.
- A voice agent connected to your field service software, which books into real technician availability, respects service areas and membership priority, and hands emergencies to the on-call technician.
Example (illustrative). A 12-technician company routes after-hours calls to a voice agent. A no-heat call from a maintenance-plan member at 9pm is booked first thing, flagged as priority, and texted to the on-call technician. A quote request is booked into an estimator's slot the next afternoon.
2. Quote follow-up
Big-ticket replacements are usually lost to silence, not to a competitor's price. A follow-up sequence that sends the quote, checks in after two days, answers financing questions and then hands the hottest leads to a salesperson recovers jobs that would otherwise go cold.
3. Reminders and on-my-way texts
A confirmation the day before and an arrival text with the technician's name cut no-access visits and the calls asking "when are you coming?".
4. Review requests
Ask for a review after a job is marked complete and paid, not before, and only when the customer has not raised a complaint. Route unhappy replies to a manager instead of the review site.
5. Maintenance plan renewals
Membership renewals and seasonal tune-ups are predictable revenue. Automate the reminders and the booking, and give the office a list of members who did not respond.
What not to automate
- Diagnosis and pricing judgement. The technician on site decides.
- Upset customers. A person calls back.
- Outbound AI calls to people who have not agreed to them. See the rules below.
Connecting to your software
- ServiceTitan: a developer portal with OAuth 2.0; your account admin generates the app key.
- Housecall Pro: open API access is included on the MAX plan ($299 a month billed annually).
- Jobber: a GraphQL API with OAuth 2.0; private custom integrations do not need marketplace review unless they connect to more than five paying accounts.
- Simpro (UK and Australia): a REST API with OAuth 2 and webhooks.
Calling and texting rules
- United States, AI voices: the FCC's February 2024 ruling treats AI-generated voices as artificial voices under the TCPA. Outbound calls need prior express consent, and prior express written consent for telemarketing. Since April 2025, consumers can opt out by any reasonable means, and opt-outs must be honoured within 10 business days.
- United States, texting: business texts from ordinary 10-digit numbers must be registered under A2P 10DLC. Carriers now block unregistered traffic.
- United Kingdom: marketing texts need consent or the soft opt-in for existing customers, live marketing calls must be screened against the TPS and CTPS, and automated marketing calls need specific consent (ICO guidance on PECR).
Service messages about a booked job, such as confirmations and arrival texts, are treated differently from marketing in both countries, but keep the two clearly separate.
How we approach it
We start with the call log: how many calls came in, when, and how many went unanswered. Then we build the answering and booking flow on top of the software you already run, test it against real calls, and add follow-ups once booking works.
Sources: US Bureau of Labor Statistics Occupational Outlook Handbook (2025 data); Invoca (May 2024, vendor); CallRail benchmark report (January 2025, vendor); Housecall Pro HVAC industry trends (March 2026, vendor); ServiceTitan, Housecall Pro, Jobber and Simpro developer documentation; FCC Declaratory Ruling FCC 24-17; Manatt on the TCPA revocation rule; Twilio and Bandwidth on A2P 10DLC; ICO guidance on PECR. Checked 6 October 2026.