The Human Diagnostic
- No. of episodes
- 167
- Latest episode
- 2026-07-27
Where can you listen?
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Looking for honest stories about people, not product reviews? You're in the right place.
The Human Diagnostic isn't a how-to HVAC podcast. It's what a 45-year Master Technician notices about people after 90,000 service calls across gas plants, oil rigs, hospital preservation systems, high-rises, feedlots, walk-in freezers, and residential homes all over Central Oklahoma.
Hosted by Dave Hartzell, each episode tells a real story from a real service call. Sometimes he's driving to the job and predicting what he's about to walk into. Sometimes he just left and he's still working through what he saw. Either way, the story turns out to be about more than HVAC.
Topics you'll hear across the season:
✅ The customer nobody wanted to take, and what changed when someone finally did
✅ Why the person researching their broken AC at midnight isn't being difficult, they're scared
✅ What 45 years of walk-ins, weddings, funerals, and broken water heaters teaches you about anxiety
✅ The tech who can fix anything but can't explain it, and why the customer doesn't trust him
✅ The review you can't place, the moment you never forget, the call that changed how you work
✅ What gets lost when we treat people like tickets, and what gets found when we don't
Whether you fix things for a living, manage people who do, or just like good stories from someone who has been everywhere and met everybody, The Human Diagnostic gives you the part of the job that never shows up in an invoice.
📍 Proudly based in Kingfisher and serving Edmond, Guthrie, Yukon, Mustang, Piedmont, Logan County, Canadian County, Blaine County, Major County, Garfield County, and the greater Oklahoma City metro area. Hartzell's Heat & Air blends old-school integrity with cutting-edge technology, from digital diagnostics to smart-home HVAC integrations.
Connect with Hartzell's Heat & Air:
📲 Facebook: facebook.com/hartzellsheatair
🐦 X (Twitter): x.com/HartzellsHVAC
▶️ YouTube: youtube.com/@hartzellsheatair6003
💼 LinkedIn: linkedin.com/in/dave-hartzell-7a687515
📧 Contact Us: [email protected]
Every call is a story. Every story is a person.
🔔 Subscribe to The Human Diagnostic and ride along.
📞 Need HVAC help in Central Oklahoma? Call (405) 375-4822
🌐 hartzellsheatair.com