5.0 Rated · Verified Google Reviews
Real reviews from your neighbors across Fort Smith, Poteau, Pocola, Spiro, and the River Valley — posted straight from Google, not written by us.
HVAC Service in Fort Smith & Beyond
Family-owned AC repair, furnace repair, installation, and 24/7 emergency service across Fort Smith, Poteau, Pocola, Spiro, and surrounding River Valley communities. Real local techs. Upfront pricing. Financing available.
Same-Day Service
Local. Honest. Fast.
We're not a national franchise. We're a family-owned HVAC company based right here in Spiro — answering our own phones, sending our own techs, doing our own work.
Same-Day Response
Call before noon and we do everything we can to be at your door today — across Fort Smith, Poteau, Pocola, Spiro, and surrounding towns.
Upfront Pricing
You see the price before any work starts. No hourly games, no upsells, no surprise charges at the end of the job.
Family-Run, Local
Based right here in Spiro, OK. Owner-operated, family-run, and accountable to the same neighbors we work for every day.
Financing Available
Big repair? New system? Financing is available with approved credit through Synchrony — including plans with no interest if paid in full within the promo period. See financing options.
Everything HVAC, Under One Roof
Residential and commercial. Repair, installation, maintenance, and emergency service. If it heats or cools, we work on it.
AC Repair
Fast diagnosis & repair for all central AC, mini-split, and heat pump systems.
See our AC repair process →Furnace Repair
Gas, electric & heat pump heating repair. Same-day service for cold snaps.
View heating services →New System Installation
Properly sized, professionally installed high-efficiency HVAC systems.
Get an install quote →Ductless Mini-Splits
Perfect for shops, barndominiums, mobile homes, garages, and home additions.
Learn about mini-splits →Heat Pump Services
Repair, replacement & maintenance for all heat pump brands.
Heat pump help →HVAC Maintenance
Seasonal tune-ups that lower energy bills and stop breakdowns before they start.
View tune-up plans →24/7 Emergency Service
HVAC emergencies don't wait for business hours, and neither do we.
Get emergency help →Commercial HVAC
Restaurants, retail, offices, warehouses, churches, and small businesses across the region.
Commercial services →New Construction HVAC
Duct design, rough-in, trim-out, and startup for builders, barndominiums, shops, and custom homes.
New construction HVAC →Smart Thermostat Installation
Nest, ecobee, Honeywell, and Sensi — installed, wired, and programmed so they actually work with your system.
Smart thermostats →Indoor Air Quality
Whole-home filtration, dehumidifiers, and UV solutions for River Valley humidity, dust, and pollen.
Improve your air →Family-Owned. Locally Run.
Clark HVAC is a family-owned heating and cooling company based right here in Spiro, OK. We built this business on a simple idea: fast, honest service shouldn't come with high-pressure sales pitches, surprise charges, or technicians working off commission. When you call, a real person answers. When we show up, we explain what's wrong in plain English and quote the price up front, before any wrench touches your system.
We work on every major brand of central AC, furnace, heat pump, and mini-split system. Our service area covers Fort Smith, Poteau, Pocola, Spiro, and the surrounding River Valley and Eastern Oklahoma communities. From quick repairs on a 90°F afternoon to full new-construction installs on a barndominium build, we handle it.
What We Fix Every Week in Fort Smith & Poteau
Arkansas River Valley humidity, Oklahoma cold snaps, and summer storms create predictable HVAC failures across Fort Smith, Poteau, Pocola, and surrounding towns. Here are the issues our techs diagnose most often.
Frozen Evaporator Coil
Fort Smith and Poteau humidity plus a dirty filter or low refrigerant freezes the indoor coil solid. We diagnose the real cause — not just thaw it and leave.
Failed Capacitor
The #1 cause of "AC won't start" calls during Fort Smith and Poteau summers. Sustained 95°F heat takes capacitors out fast. We stock replacements on every truck.
Refrigerant Leak
Older systems across the area lose refrigerant slowly. If your AC runs constantly but never gets cold, we'll find the leak and seal it right.
Dirty Condenser Coil
Cottonwood, pollen, and dust storms choke outdoor units fast in this part of the country. A clean coil can drop your electric bill by 10–20% per month.
Clogged Drain Line
Algae and slime love humid Arkansas-Oklahoma air. A blocked condensate line can flood your attic, ruin sheetrock, or shut your system down completely.
Storm & Surge Damage
Spring and summer storms hit transformers and outdoor units hard. We diagnose blown contactors, fried control boards, and surge damage same-day.
Not sure what's going on with your system? Call (918) 839-3734 and we'll diagnose it the same day.
Full HVAC Installs Done Right the First Time
We handle the big jobs. Whether your old system finally gave up and needs a full replacement, or you're building a brand new home, shop, or barndominium from the ground up — we install code-compliant, properly sized HVAC systems that actually last in this climate.
Residential replacements: condenser, indoor air handler or furnace, line set, thermostat, ductwork repairs — most full change-outs finish in one day. Same-day quotes, financing available with approved credit through Synchrony, and we walk you through your equipment options in plain English without the high-pressure sales pitch.
New construction & builders: we work with homeowners, general contractors, and builders on duct layout, rough-in, trim-out, equipment selection, system startup, and final commissioning. From custom homes and barndominiums to shops, additions, and small commercial buildings, we handle the entire HVAC scope.
7 Signs Your Furnace Won't Survive Another Winter
Fort Smith and Poteau winters are short but mean. Ice storms hit most years, and Oklahoma cold fronts push furnaces past their limits. Catch these signs before yours quits during the worst week of the year.
Strange Smells at Startup
A musty or burning smell when your heat kicks on for the first time isn't always normal. Could be dust, but could be a cracked heat exchanger.
Yellow Flame, Not Blue
Healthy gas flame should burn steady blue. Yellow or flickering flames mean incomplete combustion — a safety issue you don't want to ignore.
Sudden Spike in Bills
If your AOG or electric bill jumped without weather to explain it, your system is fighting itself. Inefficiency this winter could mean a breakdown by January.
Uneven Heating
Cold rooms upstairs, hot rooms by the thermostat? Could be a blower issue, a duct problem, or a system that's just plain undersized for your home.
Banging or Squealing
New noises mean new problems. Booms at ignition (delayed ignition), squeals (bearings), or rattles (loose ductwork) all need attention before they get worse.
15+ Years Old, No Tune-Ups
Furnaces over 15 years old that haven't been maintained are on borrowed time. A pre-season tune-up can extend life — or tell you it's time to replace.
Schedule a pre-winter furnace tune-up before the rush. Call (918) 839-3734.
How Arkansas-Oklahoma Humidity Quietly Wrecks HVAC Systems
Fort Smith, Poteau, and the surrounding Arkansas River Valley see summer humidity climb past 80% for weeks at a time. That's brutal on cooling equipment in three specific ways most homeowners don't realize.
1. Your AC works twice as hard. Cooling humid air requires the system to remove both heat and moisture. An undersized or aging unit will run constantly to keep up, driving electric bills up and wearing out motors, capacitors, and compressors years before they should fail.
2. Indoor air quality drops. When indoor humidity climbs over 60%, you start seeing condensation on cold supply registers, musty smells in closets and basements, and dust mites multiplying in carpets and bedding. Long term, that's a recipe for mold inside ductwork — exactly where you don't want it. A properly sized system and a quality indoor air quality solution handles both at once.
3. Coils corrode faster. Persistent moisture eats copper and aluminum. Outdoor condenser coils in Fort Smith and Poteau yards rust out years before the same units do in drier climates. Annual maintenance and proper coil cleaning catch this early — before a routine service call turns into a full system replacement.
We size every system we install for real Arkansas-Oklahoma conditions — not a generic spec sheet from somewhere with different weather. That alone is why our installs hold up through the worst summers and winters.
From Call to Cold Air — Fast
No confusing process. No pushy salespeople. Just three simple steps to get your home comfortable again.
Call or Text
Reach us at (918) 839-3734 anytime, day or night. A real human answers and books your visit.
Same-Day Diagnosis
Our tech arrives, finds the exact problem, and gives you an upfront quote before lifting a wrench.
Fix It Right
You approve the price. We fix it on the spot when possible, clean up, and your home is comfortable again.
Frequently Asked Questions
Don't see your question? Call (918) 839-3734 and we'll answer it on the spot.
What areas does Clark HVAC service?
Do you offer 24/7 emergency HVAC repair?
How much does an HVAC service call cost?
Do you offer financing on new HVAC systems?
What HVAC brands does Clark HVAC service?
Do you do commercial HVAC?
Do you install ductless mini-splits?
Do you do new construction HVAC?
How often should I have my HVAC serviced?
Can you install a smart thermostat?
Do you do full HVAC system replacements?
Why does my AC keep freezing up?
Still have a question? Browse our full HVAC FAQ library, read the Clark HVAC blog, or just send us a message and we'll answer it straight.
Cities We Service
Fort Smith, Poteau, Pocola, Spiro, and surrounding communities on both sides of the Arkansas-Oklahoma state line.
Comfort in Fort Smith & Poteau is One Call Away
Whether your AC quit in July or your furnace died on the coldest night of the year — Clark HVAC is ready to roll. Call now and get a real local tech on the way.
(918) 839-3734Based in Spiro — Serving Fort Smith, Poteau & Beyond
21196 Jake Smith Rd, Spiro, OK 74959 — minutes from Fort Smith, Poteau, Pocola, and all of LeFlore County.
21196 Jake Smith Rd
Spiro, OK 74959
24/7 Emergency Service Available
Last updated: May 2026