HVAC Repair & Emergency Service in Hennessey, OK | Hartzell’s Heat & Air

Pat Hennessey never made it to Kansas. He was a freighter working the trail north through Indian Territory when Cheyenne warriors caught him on July 6, 1874. They burned his wagon on the Kingfisher-Garfield county line, and that is about as close to where I drive every time I head up here on a service call. The town that grew up nearby took his name. It is a town that has earned its history. I have been servicing homes in Hennessey for 15+ years, and I know what these houses need.

Hennessey, Oklahoma: What I Know About This Town

Hennessey is farm country, plain and simple. Grain elevators off the highway, wheat fields stretching east into Garfield County, old farmhouses that were built in the 1940s and 1950s long before central air was standard. A lot of the homes I service here were not originally designed for ductwork. Central systems were retrofitted in later, sometimes well and sometimes not. Window units that have been running for twenty years are still in back bedrooms. Propane and natural gas heat is the norm. I know what a system looks like when it has been fighting against a house that was not built to accommodate it, and I know how to fix it right.

Bull Foot Park on the south end of town marks where the Chisholm Trail came through. Cattle drovers heading north to Kansas used a water well there as a re-supply stop. Today there is a cattle drive sculpture garden in its place. Route 81 runs right through the middle of Hennessey, part of the old Route 66 corridor, and the town still carries that roadside quality. The old motel on the highway has its own stories. Route 66 towns always do.

My name is Dave Hartzell. I have a Master HVAC license, I am NATE certified, and I have 45 years of experience starting at age 18. When something breaks out here at 11 PM in January or your AC quits on a 104-degree Friday, you are not calling a call center that dispatches a stranger. You are calling me, and I answer. Emergency service is transparent: $99 dispatch, $111 diagnostic with a written quote before any work starts, then repair cost. No mystery fees, no inflated after-hours markups buried in a flat number.

📞  Call (405) 375-4822 — Including Emergencies

AC Repair  ·  Heating Repair  ·  Geothermal  ·  Emergency HVAC

---

HVAC Services in Hennessey — Emergency & Routine

---

Frequently Asked Questions — Hennessey HVAC Service

Do you service Hennessey after hours or in emergencies?

Yes — I’m available for emergencies. Call 405-375-4822. Hennessey is about 20 minutes north of my Kingfisher shop, so I can get there faster than most. Emergency pricing is transparent: $99 dispatch + $111 diagnostic + repair cost. I give you written quotes before any work starts, even on a Saturday night.

How fast can Hartzell’s get to Hennessey?

About 20–25 minutes from my Kingfisher shop on a normal run. For emergency calls — no heat in winter, no AC in summer — I prioritize getting there the same day whenever possible. Call 405-375-4822 as early as you can. Morning calls get the best same-day response.

What does emergency HVAC service cost in Hennessey?

Emergency service pricing is the same as any other call, just with quicker response: $99 dispatch fee + $111 diagnostic + repair cost. The $111 diagnostic covers a full system evaluation and written quote before any work starts. It’s credited toward repair or replacement if you approve within 14 days. I don’t charge a special “emergency rate” on top — you get a straightforward breakdown of what you’re paying and why.

What does the $111 diagnostic include?

The $111 diagnostic covers a complete inspection of your HVAC system: I check electrical, refrigerant, mechanical components, and airflow, diagnose every issue I find, explain them to you in plain English, and give you written quotes before I leave. If you approve a repair or replacement within 14 days, the $111 is credited toward your invoice. It’s not a “show up fee” — it’s a real diagnostic that tells you exactly what’s wrong and what it’ll cost to fix it.

Does Hartzell’s service Hennessey regularly?

Yes — Hennessey is one of my most regular routes. It’s in Kingfisher County, about 20 minutes from my shop at 602 S Main St in Kingfisher. I’ve been out there consistently for over 15 years. Call 405-375-4822.

Looking for HVAC near me in Hennessey, OK?

When you search HVAC near me in Hennessey, Hartzell’s Heat & Air comes up because I’m genuinely close — 20 minutes away, not a national call center. Dave Hartzell: Master HVAC license, NATE certified, 45 years experience. 4.8 stars from 271 reviews. Call 405-375-4822.