Shows / The Human Diagnostic
The Human Diagnostic
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…
Episodes
- The Human Diagnostic
The $2,000 He Buried in a Dying Furnace
A man met me in his garage with a manila folder full of receipts, and he laid them out on the workbench like he was building a case. A capacitor last spring. A…
- The Human Diagnostic
The Homeowner Who Spent Two Days Fixing His Own AC
I got a call last August from a house on the north edge of Okarche. The man had been working on his own central air for two days. He told me on the phone he…
- The Human Diagnostic
The $15,000 Neighborhood Social Contagion
I worked a neighborhood out in Edmond for most of the summer of 2024. It was a development built around 2008, sixty houses, mostly two-story, mostly young…
- The Human Diagnostic
The AC Rattle She Stopped Hearing: A Kingfisher Summer Repair
There was a blower motor in a house north of Okarche that had been telling on itself for the better part of two years, and the woman who lived there could not…
- The Human Diagnostic
The AC Repair We Both Swore Would Be Quick
I want to talk about the lie everybody tells themselves, including me, and tells it again the very next day. It was June, a Tuesday, north side of Kingfisher…
- The Human Diagnostic
The Repair He Fumbled That Won Her Trust
I want to talk about the time a customer trusted me more because I screwed up in front of her. It was a March morning out past Okarche. Gravel drive, a propane…
- The Human Diagnostic
Why an Old Furnace Repair Takes Her Back to Seventeen
There's a kind of call I've come to recognize before I even get the unit open. It's an old house with one person in it, and that person has been waiting for…
- The Human Diagnostic
The Last Five Minutes of a Repair Are All She Remembered
I want to talk about how a person decides whether I did a good job, because it almost never matches what actually happened in the house. There was a furnace…
- The Human Diagnostic
Why a Fixed Furnace Still Sounds Broken to You
She called me back four times in one evening, and the system was already working when she made the second call. It was a furnace that wouldn't cycle right…
- The Human Diagnostic
Why Your Neighbor's AC Repair Makes You Miserable
I was at a customer's house in late spring. She was a woman in her early sixties, retired teacher, lived alone in a house she had raised her kids in. I had…
- The Human Diagnostic
Why Missing an AC Deal Haunts You More Than the Repair
I got a call on a Tuesday in early August. Customer in a newer build out in Piedmont, second house from the corner on a cul-de-sac. He had not had any issue…
- The Human Diagnostic
Why Her Neighbor's AC Repair Stung More Than Her Own
There is a customer of mine who runs a small construction company in central Oklahoma. He is in his early fifties. Started his business at twenty-six with one…
- The Human Diagnostic
How Fear of the Bill Wrecks a Simple AC Repair
I had a customer about two years ago who could not let me find anything wrong with his house. Not because the house was perfect. The house was middle-aged…
- The Human Diagnostic
Why Good Intentions Never Insulate the Attic
I have a customer who has been telling me for four years that he is going to insulate his attic. The materials are on his garage floor. Two pallets of R-49…
- The Human Diagnostic
The Furnace Repair That Explained My Whole Generation
I have a category of customer in their forties who I find easier to work with than almost any other group. Mostly born between 1977 and 1983. A six-year…
- The Human Diagnostic
Why Your Dog Knows Your AC Is Broken Before You Do
There is an old man in Hennessey who lives with a yellow lab named Gus. His wife passed in 2020. Same house since 1979. When I went out there for a no-heat…
- The Human Diagnostic
What a Brutal AC Repair Season Taught Me About Burnout
I have a customer in her late thirties who told me, while I was changing her filter, that she has been tired since 2018. Not sick. Not depressed. Just tired…
- The Human Diagnostic
Why the Best AC Techs Never Charge What They're Worth
I have known a lot of techs over forty-five years who were excellent at the work and could not pay their light bill. Gifted hands, customers who ask for them…
- The Human Diagnostic
Why Latchkey Kids Won't Ask the AC Tech for Help
I have a whole category of customers in their fifties who do not want me to text them updates. They want the work done. Tell them when I am on the way, do good…
- The Human Diagnostic
Why He Knew the Repair He Needed and Never Called
I have a customer who has read every HVAC blog on the internet. Early fifties, software job, smart and polite. He has a Trane variable-speed system, a…
- The Human Diagnostic
Why the Most Frugal Homeowners Refuse the Repair
I went out to a retired schoolteacher in late 2023 to talk about replacing a 1998 heat pump. Twenty-six years old, loud, limping, on borrowed time. House paid…
- The Human Diagnostic
Why a New AC Can't Fix a Home That Feels Wrong
I have a customer who told me, plain, that she does not leave her house except for the grocery store and the doctor. She is sixty-eight, a widow, in a little…
- The Human Diagnostic
How One Furnace Repair Rebuilt More Than Her House
I have a customer in her early forties who runs a small bookkeeping business out of her dining room. Single mother, two boys, a house she keeps better than…
- The Human Diagnostic
What an Emergency AC Repair Shows About Your House
A service tech sees the back of the house. The customer presents the front. The polished entryway. The candle that gets lit before company arrives. The good…
- The Human Diagnostic
Why a Broken Furnace Is Easier to Fix Than Loneliness
I went out to a house in May to install a new furnace and air handler. The customer was a man about my age, sixty-two, divorced, no kids in Oklahoma. He had…
- The Human Diagnostic
Why Some Customers Want a Silent AC Repair
There is a kind of customer who, when you walk in, does not want a relationship. She is not rude. She is not cold. She has answered the door, shown you the…
- The Human Diagnostic
Why a Bigger House Won't Cool Your Restlessness
There is a particular kind of customer I am seeing more of now than I did twenty years ago. She is in her early sixties. Her kids are grown and gone. And she…
- The Human Diagnostic
The AC Repair Quote That Made Him Give Up for Good
There is a sentence I hear at least twice a month. It comes out of customers who finally call me after their system has been broken for weeks. Sometimes…
- The Human Diagnostic
The Furnace Repair She Remembered As Her Best Service Call
A woman called me a year after a long, hard furnace repair to thank me, and she described it as the best service she ever had.That visit was a slog. Her…
- The Human Diagnostic
Why This Furnace Repair Stayed With Me
Furnace tune-up west of town last fall. A man in his late sixties, living alone in a three-bedroom he built in the nineties when his kids were teenagers. I…
- The Human Diagnostic
The AC Repair She Keeps Planning but Never Books
Same brochures on the counter that were there three years ago. I'd been to this house twice before, both times for the same aging heat pump, eighteen years old…
- The Human Diagnostic
The Last Furnace Call Before Winter
Winterization call at a lake house northeast of Guthrie, late October. The owners were closing it up for the season. Twenty-two years of the same closing. They…
- The Human Diagnostic
How an HVAC Tech Closes a Lake House for Winter
I drove out to a lake house northeast of Guthrie on a Friday morning in late October. A winterization call. The owners were closing the place up for the…
- The Human Diagnostic
Hartzell's Heat & Air: When a Customer Blames the AC Repair on a Bad Install
I pulled up to a house on a section line road south of Enid on a Wednesday in July. The man was already in the driveway, arms crossed, watching me park. He met…
- The Human Diagnostic
Why Fair Bills Trigger Survival Instincts
Format: Pre-call Runtime: ~8 minutes Source: Psychology , scarcity mindset (Mullainathan & Shafir, 2013); financial trauma; the persistence of scarcity…
- The Human Diagnostic
What an HVAC tech knows about loneliness
Format: Post-call Runtime: ~8 minutes Source: Psychology , interaction rituals and conversational closing (Goffman, 1967); leave-taking anxiety; the difficulty…
- The Human Diagnostic
Family triangulation in a furnace repair
Format: Post-call Runtime: ~8 minutes Source: Psychology , filial piety and role reversal (Boszormenyi-Nagy; relational ethics); triangulated communication in…
- The Human Diagnostic
Slower Processing Is Not Less Intelligence
Format: Post-call Runtime: ~8 minutes Source: Psychology , cognitive aging; fluid vs. crystallized intelligence (Cattell, 1963); processing speed and wisdom…
- The Human Diagnostic
Why truth costs more than air conditioning
Format: Post-call Runtime: ~8 minutes Source: Psychology , reciprocity and gift psychology (Cialdini, 1984; Mauss, The Gift, 1925); the meaning of overpayment…
- The Human Diagnostic
Stop punishing strangers for your past
Format: Post-call Runtime: ~8 minutes Source: Psychology , transference and countertransference (Freud; modern relational psychotherapy); the corrective…
- The Human Diagnostic
Why technical skills outlast your empathy
Format: Post-call Runtime: ~8 minutes Source: Psychology , compassion fatigue (Figley, 1995); vicarious exhaustion; the internal cost of sustained empathy This…
- The Human Diagnostic
Grief and the broken furnace
Format: Pre-call and post-call Runtime: ~8 minutes Source: Psychology , complicated grief, decision identity confusion; continuing bonds theory (Klass…
- The Human Diagnostic
The Invisible Work of Being Unwell
Format: Post-call Runtime: ~8 minutes Source: Psychology , illness cognition and self-efficacy (Leventhal's self-regulation model, 1980s); reduced executive…
- The Human Diagnostic
When Loneliness Crosses Professional Boundaries
Format: Post-call (and several months after) Runtime: ~8 minutes Source: Psychology , loneliness and social hunger (Cacioppo & Patrick, 2008); parasocial…
- The Human Diagnostic
Proving Competence to a Skeptical Customer
Format: Pre-call and post-call Runtime: ~8 minutes Source: Psychology , earned trust, competence signaling, and dominance hierarchies (Tooby & Cosmides…
- The Human Diagnostic
How Houses Hold Our Memories
Format: Post-call Runtime: ~8 minutes Source: Environmental psychology , place identity (Proshansky, Fabian & Kaminoff, 1983); biographical place attachment…
- The Human Diagnostic
Grieving Your Home Before You Leave
Format: Post-call Runtime: ~8 minutes Source: Environmental psychology , place attachment theory (Altman & Low, 1992); ambivalence and transitional…
- The Human Diagnostic
Why People Haggle and How to Respond
Format: Post-call Runtime: ~8 minutes Source: Psychology , Richard Thaler's mental accounting and transaction utility (1985); negotiation as identity…
- The Human Diagnostic
Why you shouldn't comfort a crying stranger
Format: Post-call Runtime: ~8 minutes Source: Psychology , emotional contagion (Hatfield, Cacioppo & Rapson, 1993); window of tolerance (Siegel, 1999) I want…
- The Human Diagnostic
The House Always Tells the Truth
She said "we're doing just fine" before I finished stepping through the door. I hadn't said hello yet. House on the west side of Guthrie, furnace not firing…
- The Human Diagnostic
Why the story is the diagnosis
She told me to sit down on the porch bench before I'd even said hello. I thought she was going to warn me about the bill. Instead she told me about the house…
- The Human Diagnostic
How to fix trust you didn't break
I pulled up to a house in Guthrie on a Friday morning in September. No-heat call, early in heating season. She opened the door and said: come on in. No hello…
- The Human Diagnostic
How Trauma Recalibrated Her Fear Filter
I got a call to a farmhouse east of Hennessey on a Wednesday afternoon in late April. The woman who called said she'd had another company out a few weeks…
- The Human Diagnostic
Why Your Brain Craves the Worst Case
I was on my way to Yukon when the call came in. System wasn't cooling. Customer needed someone out that day. I said I could be there by two. And then she…
- The Human Diagnostic
Why she wouldn't leave the utility closet
I was called out to a house in Kingfisher on a hot Thursday in July. The woman who answered the door walked me straight to the utility closet before I had my…
- The Human Diagnostic
The ethics of weaponizing customer doubt
I gave an estimate in Yukon in October for a new furnace and air handler. She was getting two bids. She called two weeks later to say she'd gone with the other…
- The Human Diagnostic
An HVAC technician witnesses a final move
A woman called from Enid in late September. They were closing on the sale of their house in three weeks and she wanted someone to check the system before it…
- The Human Diagnostic
How an AC Technician Lowered Her Cortisol
I went out to a house in Guthrie on a Thursday in May for a routine tune-up. The system was in good shape: nothing to report, clean coil, good capacitors…
- The Human Diagnostic
Why we keep patching broken machines
I went out to Hennessey in late June to look at a sixteen-year-old system that had been kept alive by a series of repairs over five years. Gary met me in the…
- The Human Diagnostic
Why an HVAC tech asked about the tree
There is a kind of customer who tells me what is wrong with the air conditioner before I have set my bag down. And then she tells me again, the same sentence…