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Business ProfileHVAC Companies in Sioux City, Iowa

O'Connor Heating & Cooling

O'Connor Heating & Cooling

O'Connor Heating & Cooling provides air-conditioning service and residential and light commercial heating in the Sioux City area. Its geothermal heat-pump work covers horizontal, vertical, pond/lake and closed-loop systems.

Last Updated October 3, 2026.

Business Highlights
  • Locally owned and operated.
  • Nearly two decades of HVAC experience.
  • Authorized Rheem installer.
  • Licensed, bonded and insured.

Service Area

Sioux City, IA; North Sioux City, SD; South Sioux City, NE; Dakota Dunes, SD; Dakota City, NE; Sergeant Bluff, IA; Jefferson, SD; Lawton, IA; Elk Point, SD; Hinton, IA; Moville, IA; Le Mars, IA; Merrill, IA; Sloan, IA; Onawa, IA; Ponca, NE; Akron, IA; Salix, IA; Remsen, IA; Kingsley, IA; and Burnsville, IA.

Active Business Listing

O'Connor Heating & Cooling is one of 11 HVAC companies ProsGrade lists in Sioux City, Iowa.

Active
Public local listing
Listing details

4 services listed, including Air conditioning maintenance, repair and installation, Heating-system maintenance, repair and installation and Duct cleaning. Open 24 hours, 7 days a week. Rated 4.2 from 61 reviews.

  • Verified listing details
  • Service information
  • Customer review signals
  • Photo gallery
  • Public contact information
  • Published local profile

How This Business Compares

How O'Connor Heating & Cooling compares with the other 10 HVAC companies on ProsGrade in Sioux City, using public Google ratings and review counts.

  • Has more Google reviews (61) than 7 of the 10 other Sioux City HVAC companies on ProsGrade.

Services Covered

4 services
  • Air conditioning maintenance, repair and installationAny brand, regardless of age; new Rheem systems; ductwork, motor, coil and thermostat repairs.
  • Heating-system maintenance, repair and installationFurnace maintenance; repairs for furnace malfunctions; Rheem system installation and replacement.
  • Duct cleaningResidential and commercial duct systems.
  • Geothermal installation and repairHorizontal, vertical, pond/lake and closed-loop heat-pump systems.

Reviews

What customers say

Customers praise efficient work and professional, knowledgeable technicians. The company has been credited with finding dangerously high carbon monoxide levels during a home cleaning visit and fitting emergency AC and furnace service in that day with an estimate beforehand. A customer complained that a company plow truck nearly hit a car while driving in snow.

Customer Reviews

Stacy Gran

I would like to give a very big shout out to O’Connor Heating & Cooling and their incredible team. Having worked in property management for several years, I’ve been fortunate to learn quite a bit about maintenance. However, one thing I did not fully realize was the importance of regularly cleaning not only your dryer vents, but also the ductwork throughout your home. During a recent cleaning at my home, the technicians from O’Connor discovered dangerously high carbon monoxide levels. This discovery truly may have saved my life. For the past several weeks, I had been feeling extremely tired and unwell. I even went to the doctor and had blood work done, but everything came back normal. Looking back now, the symptoms—persistent headaches, fatigue, and flu-like feelings—were likely caused by the carbon monoxide exposure. My son and I had both been feeling miserable and couldn’t figure out why. What’s even more concerning is that I had two plug-in carbon monoxide detectors, and neither one alerted us. That alone was a huge wake-up call for me about the importance of having reliable detection and routine HVAC inspections. The fact that the O’Connor team took the time to thoroughly check everything and discovered the issue speaks volumes about the quality, care, and professionalism of their technicians. It truly shows they are not just doing a job—they genuinely care about the safety of the people they serve. I strongly encourage everyone to have their dryer vents, ductwork, and HVAC systems checked regularly, and I highly recommend O’Connor Heating & Cooling. From the bottom of my heart, thank you for potentially saving my life.
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Chad

These people have a complete disregard for life during the winter. Whoever was flying down 75 in their plow truck almost hit a car because they think they have to do 65mph in the snow. I would never hire these people for anything.

Christine Holtzen

A good experience and very efficient. My technician was awesome, He got the job done quick, and was very friendly, focused, and informative. I would highly recommend this company, and technician to everyone! It's not many who actually care these days to help make a better day for those who needs it. Thank you!
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Lauren Edwards

O'Connor Is amazing! They've helped us twice with our AC and Furnace- once in the summer and once in the winter. Our unit is on the way out and we are just trying to keep it going as long as possible. The team is knowledgeable and genuinely cares about their customers. We really appreciate their professionalism! The tech was up-front with us on costs and gave us an estimate before doing the work. We've needed emergency service both times and they were able to fit us in that day to help. The boss person who answers the phones and schedules his guys is always so kind and listens to our needs to send the right person for the job. We would highly recommend O'Connor Heating and Cooling for any AC/Heating repairs!!
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Barry Bohlke

O'Connor Heating & Cooling was able to diagnose my problems with my old (30 year +) furnace immediately and recommended a new model that would be more efficient and give me a better peace of mind instead of putting a band aid on a failing system. It was replaced the following day quickly with extreme care in moving the new and old furnace across my kitchen floors. In addition, it is great to see a company that gives back to its community and those that are struggling. I consider every dollar I spent well worth it.
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Frequently Asked Questions

Does O'Connor Heating & Cooling offer emergency HVAC service?

It offers 24-hour emergency heating service and 24/7 air-conditioning service.

Does O'Connor Heating & Cooling provide free estimates?

It provides free estimates on all its work.

Does O'Connor Heating & Cooling offer financing?

Financing is available through FTL Finance.