📞 24/7 Emergency HVAC Service — We answer every call, day or night. Call 405-375-4822 now
Central Oklahoma’s HVAC Experts
Heating, Cooling & Geothermal — Kingfisher & Beyond
45 years of HVAC experience. NATE Certified. IGSHPA Accredited geothermal installer. Mitsubishi Diamond Dealer. Trane Comfort Specialist. Based in Kingfisher — serving central Oklahoma for 15+ years.
Spring tune-up slots are filling fast. Call 405-375-4822 or book below.
NATE Certified
$111 diagnostic — credited toward repair within 14 days
45 Years Experience
🇪🇸 Se Habla Español
Available 24/7 for HVAC emergencies · Same-day service available
BusinessRate 2026 Annual Award
Ranked #1 Air Conditioning Contractor in Kingfisher
Powered by verified Google Reviews — Earned. Respected. Recognized.
Our Services
Full-service HVAC for homes and businesses throughout central Oklahoma.
AC Repair & Service
Same-day AC repair in Kingfisher and central Oklahoma. All major brands. Upfront pricing.
Heating Repair
Furnace and heat pump repair. 24/7 emergency service. NATE Certified technicians on every call.
Geothermal Heat Pumps
IGSHPA Accredited installer. 300–500% efficiency. Utility rebates up to $2,000/ton. Oklahoma’s top geothermal contractor.
Ductless Mini-Splits
Mitsubishi Diamond Dealer. 12-year warranty on qualifying installs. Garages, additions, problem rooms.
System Replacement
Every replacement starts with a Manual J load calculation — no guessing on equipment size.
Maintenance Plans
Dave’s 360° Protection Plan. Priority scheduling, two tune-ups per year, discounted repairs.
24/7 Emergency HVAC
Heating or cooling failure? I typically respond within 45-60 minutes in Kingfisher County. We answer day and night, weekends and holidays. Call now.
Indoor Air Quality
Whole-home filtration, UV air purifiers, dehumidifiers, and ERV ventilation for Oklahoma homes.
Pricing & Fees
$99 dispatch, $111 diagnostic, $229 tune-up. Transparent HVAC pricing — no surprises before we start.
HVAC FAQ
Common questions about AC repair, geothermal, financing, rebates, and maintenance plans — answered honestly.
Not Sure What You Need?
Pick the situation that fits — I’ll point you in the right direction.
Why Hartzell’s Heat & Air
There are other HVAC contractors in central Oklahoma. Here’s what makes Hartzell’s different.
✅
Upfront Pricing
You know the exact cost before we start. No trip fees added later. No surprises on the invoice.
🎓
Engineering-Based Sizing
Every replacement and new system starts with a Manual J load calculation. We size equipment correctly, not by gut feel.
🌎
Oklahoma’s Geothermal Experts
IGSHPA Accredited Installer — one of very few in the state. Geothermal installations done right, with proper loop design.
📊
Trane Connected Diagnostics
For enrolled Trane customers, we see your system’s fault history before you call — faster diagnosis, fewer return trips.
🏠
Locally Owned for 15+ years
Employee-owned and based in Kingfisher. Our reputation is built on every job in this community, not a franchise call center.
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Financing & Rebates
Synchrony, Wells Fargo, and Wisetack financing available. We’ll help you claim every Oklahoma utility rebate your installation qualifies for — up to $2,000/ton for geothermal.
What We Know About HVAC in Central Oklahoma
45 years in this trade teaches you things no textbook covers.
Oklahoma’s Climate Is Harder on HVAC Than Most People Realize
Central Oklahoma summers regularly hit 100–110°F with relative humidity above 80% in July and August. That combination — extreme heat and high moisture — means your cooling system has to handle both sensible load (temperature) and latent load (humidity removal) simultaneously. A system designed for Denver’s dry heat will leave a Kingfisher home feeling cold and clammy in August because it was never built to pull that much moisture from the air. Oklahoma winters bring the opposite problem: ground temperatures that drop fast enough to cut a standard heat pump’s efficiency in half, plus ice storms that stress equipment that hasn’t been properly maintained. We’ve been diagnosing both extremes in this specific climate for 15+ years.
Oversizing Is the Most Common HVAC Mistake in Oklahoma
Most HVAC contractors in Oklahoma still size equipment using square-footage rules of thumb. The result is systems that are too large: they drop the temperature quickly, then shut off before removing enough humidity from the air. You end up cold but damp — and over time, that moisture feeds mold. The other consequence is premature compressor wear from short-cycling. A Manual J load calculation is the engineering standard that accounts for your home’s actual insulation values, window area and orientation, infiltration rate, ceiling height, and local weather data. Every replacement we do starts with one. It takes longer than a tape measure and a phone call, but it’s the only way to know what your home actually needs — not what a rule of thumb says it should need.
Oklahoma’s Geology Makes Geothermal Unusually Effective Here
About six to eight feet below the surface in central Oklahoma, ground temperature holds steady at roughly 59–62°F year-round — regardless of whether it’s 108°F outside in August or 14°F in a January ice storm. That stable thermal mass is what a geothermal heat pump exchanges with instead of outdoor air. In summer it’s cool enough to reject heat efficiently; in winter it’s warm enough to extract heat even when a conventional heat pump would be struggling. The result is a system that runs at 300–500% efficiency year-round in exactly the conditions that hammer conventional equipment hardest. Oklahoma’s rural electric cooperatives — CKenergy, Canadian Valley, Central Electric — offer rebates up to $2,000 per ton of installed capacity. Oklahoma utility rebates remain active — CKenergy members qualify for up to $2,000/ton, OG&E customers up to $1,000/ton. A typical 3-ton install can qualify for $6,000–$8,000 in rebates before you factor in utility savings. We are one of very few IGSHPA Accredited installers in the state — the certification that means the loop was engineered correctly for Oklahoma’s soil conditions, not just dug and filled.
When Something Goes Wrong
The most common calls we get: AC running but not cooling, furnace that won’t start, warm air blowing from the vents, and water leaking from the air handler. In most cases these can be diagnosed and resolved in a single visit. We charge a flat $99 dispatch fee and $111 diagnostic — the $111 diagnostic fee applies toward your repair if you approve the work. No stacking fees, no surprises. If the repair cost is significant, we tell you before we start. If replacement makes more financial sense than repair, we’ll say so honestly and give you both options with real numbers.
Master HVAC License
Oklahoma-licensed master technician. Not an apprentice or subcontractor doing your install.
NATE Certification
North American Technician Excellence — the industry’s highest hands-on technical standard for HVAC service.
IGSHPA Accreditation
International Ground Source Heat Pump Association — the standard for correct geothermal loop design and installation.
Trane TCS SELECT
Top tier of Trane’s dealer program. Unlocks 12-year parts warranties on qualifying Trane equipment.
A Family Business Built on Trust
Dave Hartzell opened Hartzell’s Heat & Air about 15 years ago, bringing 45 years of HVAC experience built across a 12-year run at a Watonga competitor and decades working in central Oklahoma. His daughter Shelby Hartzell runs operations — the person who makes sure every commitment the company makes actually gets delivered. Together, they lead central Oklahoma’s most credentialed HVAC team.
The original 1964 Hartzell’s van — still turning heads in Kingfisher
Employee-owned. Kingfisher-based. Upfront pricing, properly sized equipment, and work we stand behind — on every job for 15+ years.
Dave Hartzell
Owner & Founder
Shelby Hartzell
Operations Manager
15+
Years in Business
4.8 ★
Google Rating
12yr
Mitsubishi Warranty
Easy Online Scheduling
Book Your HVAC Service in 3 Easy Steps
Choose Your Service
Repair, tune-up, replacement, or maintenance plan
Pick a Time
Same-day and next-day slots available online
Get Confirmation
Instant text or email — no waiting on hold
Ready to Schedule Service?
Same-day service available. Upfront pricing. No surprises. Call or book online.
📞 Available 24/7 for heating and cooling emergencies
Serving Central Oklahoma
Hartzell’s Heat & Air provides HVAC service, repair, and installation throughout central Oklahoma including: Kingfisher, Hennessey, Watonga, Okarche, Guthrie, El Reno, Yukon, Mustang, Piedmont, Edmond, Enid, and Weatherford.
Services include AC repair, heating repair, geothermal heat pump installation, ductless mini-split installation, HVAC system replacement, indoor air quality, HVAC zoning, Manual J load calculations, commercial HVAC, and 24/7 emergency HVAC service.
Counties served: Kingfisher County · Blaine County · Garfield County · Major County · Logan County · Canadian County · Oklahoma County
Or call 405-375-4822 — $99 dispatch fee (not waived for PMA members — applies to all service calls). $111 diagnostic credited toward your repair or replacement if you approve an estimate within 14 days.
What Our Customers Are Saying
4.8 stars • 271 reviews
Meet Dave Hartzell
Dave Hartzell opened Hartzell’s Heat & Air about 15 years ago after a 45-year career in HVAC. In this short video, Dave introduces himself and explains what makes Hartzell’s different — honest work, proper diagnostics, and a commitment to this community that has defined his entire career.
Dave holds a Master HVAC License, is a NATE-Certified technician, and is an IGSHPA-accredited geothermal installer — credentials that put him in a small group of truly qualified HVAC professionals in Oklahoma.
Your Neighbor. Your HVAC Company.
A handshake and a man’s word still mean something here. Hartzell’s has been part of this community for 15+ years — sponsoring Kingfisher soccer, supporting the school band, advertising in the Kingfisher News, and mentoring the next generation of tradespeople through vo-tech.
🎓 Schools: Computer Dept & Yearbook
🤝 Vo-Tech Mentorship
🍽 Masons Pancake Breakfast
📰 Kingfisher News Shops Page
🏠 Dover & Okarche
From the Blog
HVAC tips, repair guides, and Oklahoma-specific advice from Dave Hartzell — Master HVAC licensed, Kingfisher OK, for 15+ years.
Why February Is the Best Time to Schedule Your HVAC Tune-Up in Central Oklahoma
February is Oklahoma’s slowest HVAC month — faster scheduling, better availability & off-season pricing. He…
Trusted & Certified
STANDARDAuthorized Dealer
Proudly serving Oklahoma with certified technicians and top-rated equipment
What Our Customers Say
★★★★★
4.8 out of 5
271 verified Google reviews
★★★★★
“Dave and his team installed a geothermal system for us. Sized it correctly, explained every step, and the system has been flawless. Our electric bill dropped significantly.”
— Mark T., Kingfisher OK
★★★★★
“AC went out on a 104° day. Called Hartzell’s, had a tech out the same afternoon. Diagnosed fast, gave me upfront pricing before touching anything. Exactly what you want in an emergency.”
— Jennifer R., Hennessey OK
★★★★★
“Had Hartzell’s install a Mitsubishi mini-split in my shop and a bonus room. Both units are fantastic. The 12-year warranty from a Diamond Dealer was the deciding factor. Zero issues, 2 years in.”
— Tim B., Guthrie OK
Frequently Asked Questions
How much does HVAC repair cost in Kingfisher Oklahoma?
Hartzell’s charges a $111 diagnostic fee, credited toward the repair if you approve the work. A $99 dispatch fee applies to every service call. Most common repairs run $150–$600 depending on parts. Free estimates are available for new system installations.
Do you offer emergency HVAC service in central Oklahoma?
Yes. Hartzell’s Heat & Air responds to HVAC emergencies in Kingfisher and surrounding central Oklahoma counties. Call 405-375-4822 any time for after-hours service.
What areas does Hartzell’s Heat & Air serve?
We serve Kingfisher, Garfield (Enid), Canadian, Logan, Blaine, Major, and Oklahoma Counties — including the Oklahoma City metro, Yukon, Mustang, Piedmont, Edmond, El Reno, Guthrie, Enid, Fairview, and dozens of rural communities across northwest and central Oklahoma.
What HVAC brands does Hartzell’s install and service?
We install and service Trane, RunTru, Mitsubishi, Daikin, Carrier, American Standard, and ClimateMaster geothermal systems. We are a Mitsubishi Diamond Dealer, Trane TCS SELECT dealer, and ClimateMaster GeoElite dealer — the top certification level for geothermal in Oklahoma.
Does Hartzell’s Heat & Air offer financing?
Yes. We work with three financing partners — Synchrony, Wells Fargo Home Projects, and Wisetack — to offer flexible payment options on new system installations. Ask about current promotional rates at 405-375-4822.
How long does HVAC installation take?
A standard air conditioner or furnace replacement typically takes one day. A full system replacement (both indoor and outdoor equipment) usually takes 1–2 days. Geothermal installations take approximately one week for ground loop drilling and equipment setup.
Nearby Communities We Serve
Water Heater Maintenance
Starting at $99/Year
Annual water heater inspection and service for tank, tankless, and geothermal desuperheater systems. Oklahoma’s hard water cuts your water heater’s life short — a $99 annual inspection can add 3–5 years. All brands serviced. GE RealMAX dealer.
- ✓Full safety inspection — T&P valve, anode rod, gas connections & venting
- ✓Tank flush and tankless descaling available
- ✓Desuperheater inspection for geothermal homeowners
- ✓10% off repairs — add to your existing HVAC maintenance plan
$99
/year