HVAC Replacement in Oklahoma City, OK
Dave Hartzell built Hartzell’s reputation right out of Kingfisher County, and Oklahoma City has been part of the territory for years. When OKC homeowners call, they get the same Manual J load calculation and the same installation standards that Kingfisher customers rely on. Dave spent 12 years at a Watonga HVAC company before opening Hartzell’s about 15 years ago — 45 years of HVAC experience total, and that background is why we don’t guess on sizing and don’t cut corners on installation. We’re a Trane TCS SELECT dealer and a Mitsubishi Diamond Dealer, and we pull permits on every job. Edmond, Yukon, Mustang, Piedmont, and Oklahoma City proper — all within our 60-mile service radius.
R-22 parts, older units, repeat repairs — the sooner you call, the more options you have. 405-375-4822 or chat with us in the corner for a straight answer.
Manual J Sizing · Trane Comfort Specialist · NATE-Certified · Financing Available · 405-375-4822
Free in-home estimate — no obligation, no pressure
When to Replace Your HVAC System
Repair makes sense until it doesn’t. Here’s how we help you decide:
- Age — Central AC systems typically last 15–20 years; furnaces 18–25 years. If yours is approaching or past that range, replacement often beats repair
- The 50% rule — If a repair costs more than 50% of the price of a new system, replacement usually wins financially
- Cracked heat exchanger — A cracked heat exchanger is a carbon monoxide risk and typically means furnace replacement
- Refrigerant type — Systems using R-22 (Freon) refrigerant are expensive to maintain; R-22 is no longer manufactured and prices have spiked
- Rising energy bills — A system losing efficiency year over year costs you every month; a new high-efficiency unit can pay for itself in savings
- Frequent breakdowns — If you’re calling for repairs every season, the costs add up fast
- Comfort problems — Rooms that are always too hot or cold, humidity issues, or uneven temperatures often indicate an undersized or failing system
Why Proper Sizing Matters
The most common HVAC installation mistake is putting in the wrong size system. Oversized equipment short-cycles — it cools or heats the space quickly but shuts off before removing humidity, leading to a clammy, uncomfortable home and higher energy bills. Undersized equipment runs constantly and never keeps up during peak Oklahoma heat or cold.
We perform a Manual J load calculation on every replacement job — a room-by-room analysis of your home’s actual heating and cooling needs based on square footage, insulation, windows, and orientation. This is how you get the right-sized system, not a guess based on square footage alone.
System Types We Install
Central AC + Gas Furnace
The most common setup in Oklahoma. Separate systems for heating (gas furnace) and cooling (central AC). Reliable, cost-effective, and works well in Oklahoma’s climate where both heating and cooling demands are high.
Heat Pump Systems
Heat pumps provide both heating and cooling in one unit. Highly efficient for moderate temperatures. Modern cold-climate heat pumps work well in Oklahoma winters, and can be paired with a gas furnace as a dual-fuel system for extreme cold days.
Ductless Mini-Split
No ductwork required. Ideal for room additions, converted garages, older homes without ducts, or supplemental zoning. We’re a Mitsubishi Diamond Dealer.
Geothermal Heat Pump
The highest-efficiency option available. Uses the stable temperature of the earth to heat and cool your home. Higher upfront cost but dramatically lower operating costs. We’re IGSHPA-accredited geothermal installers.
What Does HVAC Replacement Cost in Oklahoma City?
These are honest installed cost ranges — equipment + labor + materials — based on typical OKC-area homes. Prices vary with home size, ductwork condition, and equipment selected. Hartzell’s provides exact upfront quotes before any work begins.
| System Type | Installed Cost | Notes |
|---|---|---|
| AC + Gas Furnace (standard efficiency) | $7,500 – $12,500 | Most common replacement; 14–16 SEER2 |
| AC + Gas Furnace (high efficiency) | $11,000 – $17,000 | 96%+ AFUE furnace; best long-term value |
| Central Heat Pump (replaces AC + furnace) | $8,000 – $14,000 | Single system for heating + cooling |
| Dual-Fuel Heat Pump + Gas Backup | $12,000 – $20,000 | Oklahoma’s best all-weather system |
| Ductless Mini-Split (single zone) | $4,000 – $8,500 | No ductwork needed; Mitsubishi Diamond Dealer |
| Geothermal Heat Pump System | $18,000 – $35,000 | Oklahoma utility rebates available; OG&E rebate $1,000/ton |
Installed estimates for central Oklahoma. Permit fees additional. Free quotes on all new system installs — call 405-375-4822.
Our Replacement Process
- In-home assessment — We look at your existing system, ductwork, insulation, and home layout
- Manual J load calculation — Right-sized equipment recommendations based on your home’s actual needs
- Equipment options — We present 2–3 options at different efficiency and price points with honest pros and cons
- Upfront pricing — Complete installed price before you decide — no surprises
- Professional installation + 6-Month Labor Guarantee — NATE-certified technicians, installed to manufacturer specs. All labor backed by our 6-month workmanship guarantee.
- System startup & testing — Full airflow verification, refrigerant charge check, and thermostat setup
- Warranty registration — We register your equipment warranty so it’s active from day one
Brands We Install
As a Trane Comfort Specialist and Mitsubishi Diamond Dealer, our primary brands are Trane, RunTru by Trane, and Mitsubishi. We’ll recommend the right equipment for your situation — not just the brand with the highest margin.
→ See all equipment brands we install
Financing Available
HVAC replacement is a significant investment. We work with three lenders to make it manageable: Synchrony, Wells Fargo Home Projects, and Wisetack — offering low-interest and deferred-interest plans. Most approvals are same-day.
Oklahoma City Service Area
We serve Oklahoma City and the surrounding metro including Edmond, Yukon, Mustang, Piedmont, Bethany, Warr Acres, The Village, Nichols Hills, Moore, Midwest City, Del City, and surrounding Oklahoma County communities.
Frequently Asked Questions
How long does an HVAC replacement take in Oklahoma City?
Most HVAC replacements in Oklahoma City are done in one day — furnace and AC swap completed start to finish.
Most standard replacements — a furnace and air conditioner swap — take one day. More complex jobs involving ductwork modifications or geothermal installation take longer. We’ll give you an accurate timeline before we start.
What size HVAC system do I need for my OKC home?
You need a Manual J load calculation — not a guess based on square footage. We run this on every single replacement job.
We don’t guess. We perform a Manual J load calculation to determine the correct size for your specific home. Oversized and undersized systems both cause problems — proper sizing is critical.
Should I replace just the AC or the whole system?
Replace both if your furnace is over 12 years old — matched systems perform better and the combined installed cost is usually similar.
If your furnace is under 10 years old and in good condition, replacing just the AC is reasonable. If both are aging, replacing together is usually more cost-effective and ensures the components are matched correctly.
What efficiency rating should I choose for a new HVAC system?
It depends on your usage and how long you plan to stay in the home. Higher SEER/AFUE ratings mean lower monthly energy costs but higher upfront cost. We’ll help you calculate the payback period for your specific situation.
Do you offer financing for HVAC replacement in Oklahoma City?
Yes. We work with three lenders — Synchrony, Wells Fargo Home Projects, and Wisetack — offering low-interest and deferred-interest plans. Apply takes minutes and most approvals are same-day.
Is the estimate for HVAC replacement free?
Yes — estimates on new system installations are always free. We come out, assess your home, perform a Manual J calculation, and give you upfront pricing before you decide anything.
Does someone need to be home during the installation?
Yes — an adult homeowner or authorized representative should be present for the full installation. We need access to the mechanical room, attic, or crawlspace, and we walk you through the new system before we leave. You’ll also want to be there to sign off and ask questions about thermostat operation and filter schedules.
What happens to my old HVAC equipment?
We remove and haul away your old system as part of the installation. Refrigerant is recovered and disposed of per EPA regulations before the old unit is removed. You don’t need to arrange disposal — we handle it.
Are permits required for HVAC replacement in Oklahoma?
In most Oklahoma jurisdictions, a mechanical permit is required for HVAC replacement. Hartzell’s pulls the appropriate permits as part of the job — you don’t need to handle this yourself. Permitted work ensures the installation is inspected, which protects your homeowner’s insurance coverage and any applicable equipment warranties.
What a Replacement Looks Like
Every replacement starts with an honest assessment of what you have and what you actually need. We pull the old equipment, size the new system correctly with a Manual J load calculation, and install it right. Here is what that looks like in the field.
Recent Installations
Real residential replacements by Hartzell’s — the same installation standards that have served Kingfisher homeowners for 15+ years, now available throughout the Oklahoma City metro.
Trane XV premium heat pump — central Oklahoma
Trane package unit — residential install
RunTru by Trane — stone-exterior home
Trane’s 100% Performance Guarantee
As an authorized Trane Comfort Specialist™ dealer, Hartzell’s carries the 100% Performance Guarantee on every Trane system we install. If your new system fails to perform to factory specifications in the first year — or experiences a compressor, heat exchanger, or major leak failure in the first 60 days — Trane will replace the equipment. It’s a guarantee only Comfort Specialist dealers can offer.
Our Job Isn’t Done Until
- ✓Your system is running properly and fully tested before we pack up
- ✓Every question you have is answered — we don’t leave you guessing
- ✓Your home is left clean — we clean up after ourselves, every time
- ✓You understand your warranty and exactly what it covers
That’s the standard Dave Hartzell has kept for 45 years. Every technician. Every call.
Repair vs. Replace: How to Decide
Not every failing system needs to be replaced — and not every repair is worth making. Here’s the honest comparison Hartzell’s uses with every customer facing this decision:
Use the $5,000 rule: multiply repair cost by system age. Above $5,000 — replacement usually wins.
Meet the Owner
Dave Hartzell has 45 years of HVAC experience and opened Hartzell’s about 15 years ago. OKC homeowners get the same technician standards and upfront pricing that Kingfisher customers count on. Trane Comfort Specialist, Mitsubishi Diamond Dealer, NATE-certified, IGSHPA-accredited — that’s the crew that shows up to your Oklahoma City replacement.
Call 405-375-4822 or book online for a free in-home estimate.
Manual J load calculation included. No guesswork on sizing.
Nearby Communities We Serve
Ready to Replace Your HVAC in OKC?
Get an honest assessment and upfront quote. No pressure.
✓ $111 diagnostic fee — credited toward your repair if you accept an estimate within 14 days.
Content reviewed by Dave Hartzell — Oklahoma Master HVAC License #00115936, IGSHPA Accredited Geothermal Installer, Mitsubishi Diamond Dealer, Trane Comfort Specialist TCS SELECT. Hartzell’s Heat & Air, Kingfisher OK, for 15+ years.