Some companies serve a community.
I grew up in it.
I started Hartzell’s Heat & Air in Kingfisher, Oklahoma about 15 years ago (~2011), after 12 years at another local HVAC company. I have 45 years in this trade (started at 18). I hold a Master HVAC License (#00115936), NATE certification, and IGSHPA Accreditation for geothermal installation. I am a Mitsubishi Diamond Dealer, Trane TCS SELECT dealer, and BBB A+ Accredited Business, rated 4.8 stars across 276 reviews in central Oklahoma.
At a Glance
I have been taking care of central Oklahoma homes and businesses for 15+ years. This is not a franchise. This is not a call center with a truck. I live and work in this part of Oklahoma, and I treat every customer like a neighbor, because most of them are.
Kingfisher, Oklahoma · In business 15+ years · 4.8★ / 276 reviews · 405-375-4822
BusinessRate 2026 Annual Award
Ranked #1 Air Conditioning Contractor in Kingfisher
Powered by verified Google Reviews. This award belongs to every member of my team. Their loyalty and commitment to doing the job right is what earned it. You can read more about industry recognition on my press and awards page.
The Story
It started with trash duty.
I grew up watching my father work with his hands. By age ten I was picking up trash at Lee Hartzell Electric in Woodward, Oklahoma, not because I had to, but because that is where my family worked and that is what you did. By thirteen I was an apprentice electrician. Junior and senior year of high school I was on a work-release program, out at noon, leading a four-man crew of adults who were older than me in every way except experience.
Those men drove. I ran the work. A lot of them went on to build solid careers of their own. I still think about them.
From Woodward to Watonga, and everything that came with it.
After Autry Technology Center in Enid, one of Oklahoma’s finest vo-tech schools, I discovered HVAC was not just a trade. It was the thing I was built for. I went on to Oklahoma State University, where I met two men who would become lifelong friends: Sammy Tomlinson and John Thomas. All three of us went on to build HVAC companies rooted in the same values. John Thomas founded Thomas Heat, Air & Refrigeration down in Roff. Sammy built Sammy’s Heat, Air & Sheet Metal in Watonga, where he had been serving the community since 1973.
I spent twelve years at Sammy’s. Twelve years learning from Sammy and his parents, not just about systems and equipment, but about the people of this region. How they think. What they care about. What it means to shake someone’s hand and actually mean it. I sold Carrier systems to Kingfisher-area families for over a decade. Some of those families are now on their third system. Their children are calling me for the first time.
He also fought fires for five years.
During my years in Watonga, I served as a volunteer firefighter. Five years of showing up when things went wrong for other people, not for a paycheck, but because that is who I am. That did not change when I came home to Kingfisher.
Then Sprint called.
I spent seven years as the onsite engineer for Sprint, managing what would become the largest project in the company’s history, a classified national infrastructure build that required the kind of precision most contractors never face. The project involved a $20 million infrastructure upgrade with an additional $10 million component. I delivered it under budget, ahead of schedule, and with zero FCC outages on a live network.
Every piece of equipment on that project was commissioned before I left the site. Every system had an operating manual, a maintenance manual, and an identifier tag. Every door. Every fixture. Sprint asked me to name my price. I gave them a job done right instead.
“The man who helped build the infrastructure that could locate your cell phone to within one foot is the same man who will size your home’s HVAC system to within one ton, and stand behind it.”
Hartzell’s was the next step. Not a detour, the destination.
When I founded Hartzell’s Heat & Air, I named it after the place where I first learned what work was, Lee Hartzell Electric, Woodward, Oklahoma. I brought with me everything Sammy taught me, everything my father taught me, and a standard of documentation and accountability most HVAC companies in this state have never been asked to meet. My daughter Shelby runs operations today. When I make a commitment to a customer, Shelby is the one who makes sure it happens.
Why My Work Is Different
A lot of HVAC companies pay their technicians by the hour. I do not. My technicians are compensated based on the quality and completeness of the work they complete, which means the person in your home has a direct personal stake in getting it right. There are no incentives here to run up hours, oversell equipment, or recommend repairs that are not needed. The incentive is to solve the problem correctly the first time and leave a customer who is glad they called.
That is how my people are rewarded, and it is how this company has maintained a 4.8-star rating across 276 Google reviews.
My technicians are paid to solve problems, not to spend time.
That difference shows up in your home every single time.
I back every job with a 6-month labor guarantee. I use Trane Connected Diagnostics for remote monitoring on qualified systems. And I size every system using Manual J load calculations, not guesswork, not what fits in the truck.
You Get Photos of the Work, Automatically
Customers love seeing before and after photos of what was done. So the moment a job is marked complete in Housecall Pro, my system automatically sends those photos directly to the customer, no manual emails, no forgotten follow-ups. Just instant, professional communication.
Triggers when job is marked complete in Housecall Pro
Confirms before & after photos are attached
AI drafts a clean, customer-friendly summary email
Photos delivered to the customer automatically
Send status logged in Google Sheets for accountability
Customers get visual proof of the work without anyone on my team lifting a finger.
Credentials & Partnerships
Geothermal certification held by very few Oklahoma contractors.
Best Newcomer of the Year 2016, Air Products Supply.
Top tier Trane dealer status.
Qualifies customers for the 12-year manufacturer warranty.
North American Technician Excellence certification.
Manual J, S, and D load calculations on every installation.
Oklahoma License #00115936.
Better Business Bureau accredited since 2014.
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In 2026 I was selected for inclusion in Marquis Who’s Who. The full story, along with other recognition the company has earned, lives on the press and awards page.
Community
This company exists because of Kingfisher and the surrounding communities. I sponsor Kingfisher Yellowjacket soccer. I support the schools, computers, yearbooks, vo-tech programs. I show up to the Masonic Lodge pancake breakfast every year to support the school band. I mentor vo-tech students by bringing them onto real job sites because someone did that for me once and it changed everything.
I serve Kingfisher, Watonga, Hennessey, Enid, the Oklahoma City metro, and communities throughout central Oklahoma. For geothermal work, I travel statewide. If you used to call Sammy’s Heat, Air & Sheet Metal in Watonga, welcome. A lot of your neighbors made the same call. I am glad you found us.
The Team
Dave Hartzell, Owner
Born in Mooreland, OK. Raised in Woodward, OK. Master HVAC License. Geothermal specialist. Sprint-certified infrastructure engineer. Watonga Volunteer Fire Department (5 years). Kingfisher resident since starting the company around 2011.
Shelby Hartzell, Operations Manager
My daughter. If I make a promise, Shelby is the one who makes sure it happens. She manages day-to-day operations and keeps the company running the way I built it to run.
Joshua Hartzell
My son. Self-employed software developer based in Oklahoma City.
My Technicians
NATE certified, background checked, and trained to the standard I have held myself to since I was thirteen years old running a job site in Woodward.
Nearby Communities I Serve
Meet the Team
CarlMaintenance Tech
AceHVAC Tech
DustinHVAC Installer
Ready to Work With Me?
Central Oklahoma’s most credentialed HVAC team. Call me today or get a free estimate on a new system.
Frequently Asked Questions
How long has Hartzell’s Heat & Air been in business?
Hartzell’s Heat & Air has been serving Kingfisher and central Oklahoma for 15+ years. Dave Hartzell, the owner, has 45 years of HVAC experience.
What certifications does Hartzell’s Heat & Air hold?
I hold a Master HVAC License (#00115936), NATE certification, IGSHPA Accreditation for geothermal, Mitsubishi Diamond Dealer status, Trane Comfort Specialist TCS SELECT certification, and ClimateMaster GeoElite dealer status. I am also a BBB A+ Accredited Business and ACCA member.
Is Hartzell’s a locally owned company?
Yes. Hartzell’s Heat & Air is 100% locally owned and operated. I work in the field personally on service calls and installs. This is not a franchise or national chain.
What is the 6-Month Labor Guarantee?
Every repair and installation performed by Hartzell’s Heat & Air comes with a 6-month labor guarantee. If the same problem returns within six months of my service, I fix it at no labor charge. That is my commitment to doing the job right the first time.
Does Hartzell’s Heat & Air serve Spanish-speaking customers?
Sí, Se Habla Español. I serve the Spanish-speaking community throughout Kingfisher and central Oklahoma. Call 405-375-4822 to schedule service in Spanish.