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Top-Rated Geothermal heating or cooling system installers in Union City - Updated Nov 2026

Avatar for Comfort Concepts Heating & Air Conditioning
Comfort Concepts Heating & Air Conditioning
5.0(
12
)
Geothermal Heating or Cooling System - Install

Serving Union City, OK and surrounding areas

In business since 2014

Free estimates

Emergency services offered

"It went absolutely amazing! I cannot express enough just how professional and helpful Mike is! He helped me over the phone when I first called and walked me through specific things about our HVAC system, He gave us an exact and very fair quote for repair and replacement and he was on time and got us back up and running so quickly. He is just so knowledgeable and respectful and we had a great experience with him fixing our system and I highly recommend giving him a call if you are having trouble with your HVAC system."
Lennox 21 SEER Heat Pump
Lennox 14 Seer Heat Pump
Lennox 80% Single Stage Furnace
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Lennox 80% 2-Stage Furnace

+7

Recommended by91%of homeowners
Avatar for Advent Heat, Air, Plumbing & Electrical
Advent Heat, Air, Plumbing & Electrical
4.6(
168
)
Geothermal Heating or Cooling System - Install

Serving Union City, OK and surrounding areas

In business since 1991

Free estimates

Credit card accepted

"They came out once to add freon to my very old system. They encouraged me to replace it and I knew it needed it but we decided to wait. A couple months later, they called with a great deal and we decided to go for it. They came out the next day! The guys were efficient and thorough. The new system has been in place for three months now and I am very pleased with their work and my new system."
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+9

Recommended by93%of homeowners
Avatar for Airco Service Inc
Airco Service Inc
4.6(
429
)
Geothermal Heating or Cooling System - Install

Serving Union City, OK and surrounding areas

In business since 1961

Free estimates

Emergency services offered

"We have used Airco for annual maintenance on our home HVAC.  Our upstairs unit has had a coolant leak for a while.  Other servicers wanted to just top up the coolant, which has been getting more expensive with the rising cost of coolant and government regulations.  Airco checked for the source of the leak and determined that it was in the evaporator coil.  Government regulations do not allow replacement of just the coil since it uses R-22 coolant.  Airco sent someone to check our cooling needs, measured the area to be cooled and advised on the size of unit needed.  I asked about getting a larger unit with more heating and cooling capability but they said that it would be a waste of money (although it would have been more money for them).  They also advised on the different units available and credits available for installing a more efficient unit then what we had.  We selected a unit and within a week it was installed and operating.  It working great, and we're even letting it carry some of the load for our older unit which covers the downstairs zone in our home."
Recommended by92%of homeowners
A-1 Professional Htg & AC
4.7(
12
)
Geothermal Heating or Cooling System - Install

Serving Union City, OK and surrounding areas

In business since 1984

Emergency services offered

Credit card accepted

"We were first introduced to A-1 Professional via a home warranty company claim many years ago, but quickly realized that this company is a cut above anyone we've worked with in that industry. We now give them ALL of our hvac work, whether under warranty or not. We have had them do everything from simple repairs, to deep refurbs, furnace replacement and at multiple properties.They are extremely honest and their expertise is top notch. We trust them completely and they have never let us down in dozens of service events. Any complaints I have heard about this company generally involve a warranty company. Those complaints should be targeted at the warranty company/companies, not this contractor. Keep in mind that any contractor working through a home warranty company has their hands tied completely as it is generally the warranty company's goal to do the least amount possible to patch/repair a broken system. Yet, I have seen A-1 (time and time again) do the right thing and make the best of a challenging situation. I will continue to use this contractor, regardless of whether I have a warranty claim or it's on my own dime. In case anyone is wondering, I have no affiliation with A-1, other than being a satisfied customer of theirs for roughly 20 years. It's my pleasure to give A-1 Professional Heating and A/C my top recommendation.
"
Recommended by91%of homeowners
Avatar for North Alabama Technical Services
North Alabama Technical Services
4.9(
124
)
Geothermal Heating or Cooling System - Install

Serving Union City, OK and surrounding areas

In business since 2010

Emergency services offered

Credit card accepted

"Excellent service, very fast response to my request for service, picked up laptop, diagnosed issues. Initially thought it was an OS update issue but the hard drive had failed along with other components (including 'CPU). Because other components were involved, a new solid state hard drive was put into a laptop with a working processor - same type CPU as in the failed unit. The laptop was repaired and returned in less than a week. This company picked up and dropped off the laptop (driving from Huntsville, AL (about 60-70 minutes)-- great service in this covid environment. I would recommend this company to my family./friends and will use again."
2014 Super Service Award Winner!
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Recommended by97%of homeowners
Avatar for Bnd mechanical
Bnd mechanical
5.0(
10
)
Geothermal Heating or Cooling System - Install

Serving Union City, OK and surrounding areas

In business since 2010

Free estimates

Emergency services offered

"We wanted the top of the line, with the latest technology, and BND came through like a champ. Now my thermostat talks to the Internet, which is tough to do with a dual fuel system. We had received quotes from the big name HVAC providers but they wanted double the price for the equipment and they determined their charges in labor by consulting their *book* not by how many hours they spend or the complexity of the job.
BND was a refreshing change back to doing business with a real small businessman who knows his trade rather than a slick salesman. Thanks, Benny!
"
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Recommended by100%of homeowners
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