Rex is the AI engine behind ONEREQ PRO. He scans data plates, diagnoses problems, recommends parts, routes vendors, and guides your techs through every job — in English or Spanish. He never calls in sick, never orders the wrong part, and works 24/7.
Not a chatbot you have to open. Rex is baked into every job, diagnosis, estimate, invoice, and photo — in-line where the work happens. English or Spanish, same engine.
Tech points the iPad camera at any data plate. Rex reads make, model, serial, age, refrigerant type — even on faded plates. Snapshots saved to the equipment row.
GPT-4 VisionTech rambles into the iPad. Rex rewrites it as a professional customer-facing diagnosis with recommendations. Tech approves before save.
Whisper + ClaudeRex reads symptoms, suggests parts from your pricebook, routes to correct vendor with warranty compliance.
Rex blocks wrong-sized coils, mismatched tonnage, wrong breakers before the order goes out — across HVAC, plumbing, and electrical. Kills return trips.
Cross-tradeSpots replacement opportunities automatically from equipment age + service history. Flags appear on the job list and inside Comfort Advisor.
Age + HistoryRex surfaces trade-specific tips, known-issue alerts, and callback-prevention nudges right when the tech needs them. Tailored to the day's job list.
Field Coach1,200+ diagnostic scenarios. Rex reads symptoms and returns likely causes ranked by confidence with callback-prevention flags.
Every Rex prompt, every diagnosis rewrite, every Comfort Advisor wizard renders in the customer's language. Toggle flips the entire app, including the Superheat/Subcooling calculator.
Same EngineImage generation, diagnosis, and chat route through Vercel AI Gateway with OpenAI/Anthropic fallback. Tenant-controlled spend and provider selection.
Multi-providerThe Rex AI panel handles diagnosis, parts, and notes inline. The Scanner reads any data plate, even on faded equipment. Both live inside the iOS Tech App.
Tech speaks in field shorthand. Rex rewrites in customer-facing English (or Spanish). Tech approves before save.
"checked the unit outside compressor running but not cooling, air handler filter is super dirty, drain pan has standing water, thermostat reads 82 but set to 72..."
"Inspected outdoor condensing unit. Compressor operational but system not producing adequate cooling. Found severely dirty air filter on indoor air handler. Drain pan contained standing water, indicating restricted condensate line. Thermostat showed 82°F indoor temperature against a 72°F setpoint."
Preventing mistakes before they happen — not catching them after.
R-410A (25 lb) — Johnstone Supply, in stock. TXV kit — Carrier Enterprise, OEM, warranty-compliant. Both match the model. Added to your requisition ✓Guiding your techs with personality and purpose, on every step of every job.
Welcomes you to the app
Analyzing your problem
Walks you through the answer
Shows recommendations
Job complete!
Book a demo. We'll run Rex on a real job from your shop — data plate scan, diagnosis, parts routing, the works. "I never call in sick, never order the wrong part, and I work 24/7." — Rex