Full-Stack HVAC AI System: AI Ads, Lead Qualification, Nurturing, and Customer Support on Autopilot
Liam built a 4-pillar AI system for HVAC businesses that generates leads with AI video ads, qualifies them instantly, follows up within 60 seconds, and handles customer support 24/7 — all without human involvement
The Strategy
Liam of MeshLine AI built a complete end-to-end AI system for HVAC businesses targeting $100K/month in booked jobs. The system has four pillars: AI ad generation using Claude for scripts and HeyGen for AI video avatars, AI lead qualification using Facebook form conditional logic and a Synthflow AI caller that contacts leads within 60 seconds, AI nurturing using Synthflow for outbound follow-up calls and Make.com for omni-channel text messaging across Instagram, Facebook, SMS, and email, and AI customer support using a Synthflow website chatbot and Make.com text agents for all inbound inquiries. Everything connects through GoHighLevel as the CRM and workflow automation layer.
How It Works
AI ad generation: Use Claude to write psychologically engineered ad scripts — specifically testimonial-style storytelling where a person describes how a friend solved their HVAC problem with the business. Use HeyGen to turn the script into an AI avatar video. Edit with basic B-roll and post to Facebook and Instagram as Meta ads.
Immediate lead qualification: Set up a Facebook lead form with conditional logic — prospects who answer disqualifying questions (budget too low, wrong service type) are automatically filtered out before entering the pipeline.
AI confirmation call: Connect Synthflow to GoHighLevel. When a qualified lead submits the form, Synthflow automatically calls them within 60 seconds to confirm their information and verify their answers — eliminating fake or accidental form submissions.
Appointment setting for non-bookers: Create a separate Synthflow agent and GoHighLevel workflow that triggers outbound calls to leads who opted in but did not book a calendar slot. Agent asks if they found what they were looking for and books them directly into the calendar.
Omni-channel text nurturing: Build a Make.com AI agent connected to GoHighLevel that sends personalized messages across SMS, email, Instagram, Facebook, and Messenger for three scenarios — leads that do not self-book, canceled or no-show appointments, and initial question answering.
Appointment reminders: Set up GoHighLevel workflows triggered by appointment booking — send reminders at 24 hours, 3 hours, and 1 hour before the appointment via SMS and email automatically.
Website chatbot: Deploy a Synthflow AI widget on the HVAC business website — acts as a 24/7 phone-based receptionist that answers questions and captures new leads from site visitors.
Omni-channel customer support: Use Make.com to build text agents for every inbound channel — texts, emails, Instagram DMs, Facebook messages — that respond with educated, sales-optimized answers 24/7.
Results
Liam's agency MeshLine AI implements this system for HVAC businesses targeting $100K/month in revenue. The MIT Business study cited in the video shows that contacting leads within 5 minutes results in 391% higher conversion rates — the Synthflow sub-60-second call cadence is designed specifically around this data point. The double screening process (form conditional logic + confirmation call) eliminates unqualified leads before they enter the sales pipeline.
Our Take
This is the most comprehensive full-funnel HVAC AI system documented on BuiltWithAgents — it covers every stage from lead generation to closed deal. Most AI agent case studies focus on one piece (just the voice agent, or just the ads). Liam's four-pillar approach treats the entire revenue operation as an AI system. The 60-second speed-to-lead via Synthflow is the highest-leverage piece — the MIT conversion data makes a compelling case for why this alone can transform an HVAC business. The HeyGen AI avatar ad strategy is interesting and underused: most HVAC businesses have zero video content, so an AI-generated testimonial-style ad immediately stands out. GoHighLevel as the connective tissue is a solid choice for trades businesses — it handles CRM, calendar, workflows, and multi-channel messaging in one platform. Best suited for HVAC business owners or agencies building done-for-you AI systems for local service businesses.
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