Most HVAC shops between 10 and 50 people run ServiceTitan, Housecall Pro or Jobber for dispatch, and QuickBooks for the books. The AI that pays here is narrow. First, answering the calls you miss at 7 am, at lunch and after 5 pm: one booked no-heat call at a $450 ticket covers a year of a $29 add-on. Second, drafting maintenance-agreement renewals and estimate follow-ups from the data already in your field-service software. Third, summarising long commercial bid packages. Ignore AI diagnostic tools that promise to replace a tech's judgment, and anything that quotes prices to customers without a person checking.