AI follow-up calls for open estimates: HVAC and plumbing quotes

What it is

An estimate follow-up agent calls customers who received a quote and have not said yes. It identifies itself and the company, says why it is calling, answers scope questions from the estimate record, and either books the installation or captures the reason the customer is hesitating. Every outcome is written back to the field-service system or CRM with a reason code, and every "stop calling" is applied before the call ends.

It is an outbound artificial-voice call, which changes everything about how it is built. The consent record and the calling window are checked by the platform before the dial, not by the language model during the call. The first ten seconds are fixed: caller identity, company, automated assistant, purpose, callback number. Only then does the conversation begin.

Contractors call this quote follow-up or unsold estimate calls. Groups call it an outbound sales-assist voice agent and put it under the same governance as any marketing campaign.

Who buys it

• HVAC replacement and plumbing contractors with a large book of open estimates from spring and autumn that nobody in the office has time to chase.
• Owners who run comfort advisors on commission and want the routine follow-up done before the advisor spends time on it.
• Multi-branch groups with a marketing function that already manages consent, suppression lists and campaign windows, and wants voice added to email and SMS.

Budget owner: the owner or sales lead; in groups, marketing with legal or compliance sign-off on the consent flow and the script.

KPIs

Measure your current close rate on estimates older than seven days for one month before launch, and count how many of those estimates anyone actually spoke to. Then track consent coverage before dial, calling-hour compliance, contact rate, close lift on the same cohort, objection capture, and opt-outs honoured.

The traps: a close lift that is not tied to lead source is a story, not a measurement; and a contact rate that rises because the attempt cap was quietly raised is a compliance problem dressed as a sales result. The contact-rate target above is a rule of thumb; your list, your market and your cap decide the real number.

Demo script

Have the vendor call your own phone from a sandbox with a test estimate on it. The customer record should be yours, with a time zone that is not the vendor's.

1. Pre-dial check. Remove the consent flag from the test record and start the campaign. Pass: the dial is skipped and logged with the reason. Fail: your phone rings.
2. Window check. Set your record's service address to a time zone where it is currently 7 a.m. Pass: the dial is held until the window opens. Fail: your phone rings.
3. Opening. Restore both and take the call. Pass: within ten seconds you hear who is calling, which company, that it is an automated assistant, why, and a callback number. Fail: it opens with "Hi, is this a good time?"
4. Interruption. Cut in during the opening with "who is this again?" Pass: it stops and repeats the company name and purpose in one sentence.
5. Scope question. Ask "did the quote include removing the old unit?" Pass: it answers from the estimate line items. Fail: it guesses or says it does not know without offering a callback.
6. Price objection. Say a competitor quoted less. Pass: it does not invent a discount; it captures the competitor and the amount if offered, and offers a callback from the estimator or mentions approved financing. Fail: it offers ten percent off.
7. Ambiguous time. Agree to book and say "sometime next week". Pass: it offers real install windows from the board and names the dates.
8. Phone read-back. Give a different callback number. Pass: digit by digit, then a yes.
9. Eight seconds of silence. Pass: one short prompt, then a graceful close with a callback number. Fail: it fills the silence with chatter or hangs up abruptly.
10. Opt-out mid-sentence. Say "look, just stop calling me" while it is talking. Pass: it stops, confirms it will not call again, and the suppression list shows your number before the call ends.

Then check the record: outcome, reason code, attempt count, consent reference and the window rule applied.

Compliance notes

In the United States, the FCC's February 2024 ruling confirms that AI-generated voices are artificial or prerecorded voices under the TCPA. The rule as published requires prior express consent for artificial-voice calls, prior express written consent where the call is marketing to a mobile number, identification of the business at the start of the message with a callback number, and telephone solicitations only between 8 a.m. and 9 p.m. in the called party's local time. Whether an estimate follow-up is a "solicitation" is a question for counsel; treating it as one is the conservative design. In the United Kingdom, the ICO's guidance says an automated marketing call needs the recipient's specific prior consent under PECR Regulation 19, and that general marketing consent or consent for live calls is not enough; live calls to numbers on the Telephone Preference Service also need consent. In Australia, the telemarketing industry standard permits calls Monday to Friday 9 a.m. to 8 p.m. and Saturday 9 a.m. to 5 p.m., none on Sundays or national public holidays, the caller must identify the employer and purpose, and the Do Not Call Register applies unless consent exists. Record the call only after announcing it. All of this is informational, not legal advice; the compliance rows on this page carry the sources.

Build or buy

Buy if you are a single-location contractor and the vendor can show the pre-dial consent and window checks running as platform rules, not prompt text. Build or use a platform if your marketing team already owns consent, suppression and campaign scheduling and wants voice as one more channel under the same controls. In either case, the acceptance test is the pair of skipped dials in turns one and two of the script. A vendor whose agent rings your phone on either of them has shown you where the compliance lives.