HVAC Installation in Fort Smith & Poteau
Full system replacements, new construction HVAC, and properly-sized installs done right the first time. 10-year parts + 1-year labor warranty on every install. 0% financing available for qualified customers.
Free Quotes
Install It Right the First Time.
A new HVAC system is one of the bigger investments you'll make in your home. We treat it that way — with proper sizing, clean workmanship, honest pricing, and a warranty that backs every install.
Strong Warranty
Every install backed by a 10-year manufacturer parts warranty and a 1-year labor warranty from Clark HVAC.
Sized Correctly
We do real load calculations on every install. No oversized systems that short-cycle, no undersized units that never keep up.
0% Financing
0% financing for qualified customers. Apply by text in seconds and most decisions come back the same day.
Local & Family-Owned
We're based in Spiro, OK and we're still here next year. No call centers, no high-pressure sales reps.
Every Piece of Your HVAC System
Full system change-outs, single-component upgrades, or brand-new construction installs — we handle every piece, from the outdoor unit to the thermostat to the ductwork.
Central AC Systems
Replacement and new installation of central air conditioning systems sized for your home.
Included in every estimateGas Furnaces
Natural gas and propane furnaces installed with proper venting, drainage, and safety checks.
Included in every estimateHeat Pumps
Split systems and packaged heat pumps for efficient year-round heating and cooling.
Included in every estimateAir Handlers & Coils
Matching indoor equipment so your new outdoor unit actually performs how it should.
Included in every estimateMini-Split Systems
Ductless installs for shops, barndominiums, additions, and mobile homes.
Included in every estimateDuctwork
Repair, modification, and full new-construction ductwork. Proper airflow is half the battle.
Included in every estimateSmart Thermostats
Ecobee, Nest, Honeywell, Sensi — installed, wired correctly, app set up before we leave.
Included in every estimateNew Construction
Builder & contractor partnerships. Rough-in, trim-out, startup, code-compliant from day one.
Included in every estimateWhy "Properly Sized" Matters More Than the Brand.
A $12,000 high-efficiency system installed wrong will perform worse than a $6,000 mid-tier system installed right. We see it all the time — homeowners pay for a premium unit, then it short-cycles for 12 years because the previous installer oversized it. Or it runs constantly and never keeps up because someone undersized it. That's why we do real load calculations on every install — square footage, insulation, window count, duct condition, ceiling height, and the actual layout of your home.
We install full system change-outs for homeowners across Fort Smith, Poteau, Pocola, Spiro, and surrounding towns. We also work with builders and contractors on new construction HVAC — custom homes, barndominiums, shops, additions, and small commercial buildings. Every install includes proper sizing, clean workmanship, startup testing, and a warranty that backs the work.
6 Signs It's Time for a New HVAC System
Not every breakdown means you need a new system — but at a certain point, repairs cost more than replacement and you keep pouring money into something that's going to die anyway. Watch for these signs.
System Is 12+ Years Old
HVAC systems typically last 12–15 years. Once you're past that point, efficiency drops sharply and major failures become a "when," not an "if."
Repair Cost > 30% of Replacement
If a repair quote is more than 30% of what a new system would cost, replacement is almost always the smarter call. We'll do the math with you honestly.
Energy Bills Keep Climbing
Same usage, higher bills every year? Old systems lose efficiency over time. A new high-SEER unit can cut cooling costs 20–40% on a hot Arkansas summer.
Refrigerant Leaks Twice or More
One leak is a repair. Two or more usually means the coil is shot. R-22 (old freon) is also getting expensive — at a certain point, replacement wins.
Rooms Never Feel Comfortable
Hot upstairs, cold downstairs, can't hit the thermostat setting? Usually a sizing problem or worn-out equipment that a repair won't actually fix.
Constant Repairs
Three service calls in two years? You're funding someone else's next project. Roll that money into a new system with a 10-year parts warranty instead.
Not sure if it's time to replace? Call (918) 839-3734 for an honest assessment — we'll tell you straight if repair still makes sense.
10-Year Parts + 1-Year Labor on Every Install.
Every HVAC system we install comes with a 10-year manufacturer parts warranty covering compressors, coils, and major components, plus a 1-year labor warranty from Clark HVAC covering installation workmanship. Translation: if something fails because of a defective part or because we didn't install it right, you don't pay to fix it.
We're not a company that disappears after the install. We're local, family-owned, and based in Spiro, OK — when something needs warranty attention, we're the same phone number you called the first time. No transferred warranties, no "sorry, that's the manufacturer's problem now."
What's included on every install: manufacturer registration, proper startup documentation, system commissioning checks, a written invoice with warranty terms, and a walkthrough so you know how to use your new system.
From First Call to System Startup
No surprises, no guessing. Here's exactly what happens when you hire Clark HVAC for a new install.
1. Free On-Site Quote
We visit your home or job site, look at the existing system (or plans, for new construction), and give you written options with upfront pricing.
2. Load Calculation
We size the new system based on real numbers — square footage, insulation, duct condition, sun exposure, layout. Not a guess from your last unit's tonnage.
3. Removal & Disposal
We pull the old equipment, recover refrigerant to EPA standards, and haul it away. You don't have to deal with any of it.
4. Clean Installation
Outdoor unit set level on a proper pad, indoor coil or furnace mounted right, lines brazed clean, drains plumbed, thermostat wired, ductwork sealed.
5. Startup & Testing
Refrigerant charge verified, airflow measured, temperature split checked, electrical readings logged, thermostat programmed, every safety control tested.
6. Final Walkthrough
We show you how to use your new system, set up the app if it's smart, hand you the warranty paperwork, and leave the work area cleaner than we found it.
Ready to get started? Call (918) 839-3734 for a free on-site quote.
Why Most HVAC Installs Are Sized Wrong
Walk into 10 random Fort Smith or Poteau homes and you'll find at least 7 HVAC systems that are the wrong size for the house. Sometimes way oversized, sometimes too small. The previous installer just looked at the tonnage of the old unit and matched it — or rounded up "just to be safe." Neither is right.
Oversized systems (most common mistake). An oversized AC cools the air fast but doesn't run long enough to pull out humidity. Your house feels cold AND clammy. The system also short-cycles — turning on and off constantly — which destroys compressors and capacitors years before their time. Your power bill goes up, not down.
Undersized systems. The AC runs all day, never quite hits the thermostat setting, and you blame the equipment when the real problem is sizing. The unit burns out fast because it never gets a break.
The fix: real load calculations. Industry standard is called Manual J — it accounts for square footage, ceiling height, window count and orientation, insulation R-values, ductwork condition, and how the home actually loses or gains heat. We do this on every install, not just on the big jobs. It's the difference between a system that runs perfectly for 15 years and one that limps along until it dies in year 8.
From First Call to Installed System
No confusing process. No pushy salespeople. Three simple steps to a properly installed HVAC system that lasts.
Call or Email
Reach us at (918) 839-3734 or service@clarkhvac.co. A real human answers and books your free quote visit.
Free On-Site Quote
Our tech arrives, evaluates your home or job site, and gives you written install options with upfront pricing — no high-pressure pitch.
Install Day
You approve the quote. We install your new system — usually in one day — and walk you through how to use it before we leave.
What Customers Say About Our Installs
5.0 stars across 62+ verified Google reviews. Here's what neighbors who hired us for a new system are saying.
"Brand new unit installed — fantastic service, easy to work with. ⭐⭐⭐⭐⭐"
"With sub-freezing temperatures Bryon and team came in quickly, getting the heat up and running. His price was extremely fair."
"Clark HVAC did an excellent job replacing my blower fan in a timely, efficient, and cost saving manner."
HVAC Installation FAQ
Common questions about new HVAC system installation. Don't see your question? Call (918) 839-3734 and we'll answer it on the spot.
How long does an HVAC installation take?
Do new HVAC installations come with a warranty?
How much does a new HVAC system cost?
Do you offer financing on new HVAC installations?
Should I repair or replace my old HVAC system?
Do you install HVAC systems for new construction?
What size HVAC system do I need?
What areas do you install HVAC systems in?
Will you remove and dispose of my old HVAC system?
How long does a new HVAC system last?
Do you install heat pumps?
Do you handle the ductwork too?
HVAC Installation Across the River Valley
We install new HVAC systems throughout the Arkansas River Valley and Eastern Oklahoma. If your town isn't listed, give us a call — odds are we cover it.
Ready for a New System?
Free on-site quotes. 10-year parts + 1-year labor warranty. 0% financing available. Call or email and we'll get you scheduled for a no-pressure quote visit.
(918) 839-3734Based in Spiro — Installing Across the River Valley
21196 Jake Smith Rd, Spiro, OK 74959 — covering Fort Smith, Poteau, Pocola, and surrounding communities.
21196 Jake Smith Rd
Spiro, OK 74959
24/7 Emergency Service Available
Last updated: May 2026