O'Neill Heating & Air Conditioning Services
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About O'Neill Heating & Air Conditioning Services
O'Neill Heating & Air Conditioning Services operates from Columbia, South Carolina, with a current rating of 3.7 stars across nine posted customer reviews. The company maintains round the clock availability for emergency calls, a practical feature for residents of the capital city where summer temperatures routinely push past ninety degrees. Owner Denis O'Neill appears personally in customer feedback, describing hands on involvement in repairs and warranty claims. The business serves Columbia proper alongside neighboring communities in Richland County and the Lexington County border areas.
What distinguishes this contractor is the straightforward approach reported in reviews: straight talk about repair costs, a willingness to explain what went wrong, and occasional no charge fixes when the problem proves simpler than initially diagnosed. One reviewer documented an instance where the technician addressed a drainage issue without dismantling equipment, resolving the concern for free. The company handles both routine maintenance and larger projects such as complete duct replacement in older homes.
What Customers Say
Four of six reviewers awarded five stars, with praise focusing on honesty, reliable response, and fair pricing. Negative feedback points to follow through problems on scheduled appointments and concerns about the durability of ductwork installations in homes built before 1960.
Working Hours
| SundayToday | Open 24 hours |
| Monday | Open 24 hours |
| Tuesday | Open 24 hours |
| Wednesday | Open 24 hours |
| Thursday | Open 24 hours |
| Friday | Open 24 hours |
| Saturday | Open 24 hours |
Services
Emergency AC Repair
Diagnostic and repair services for cooling system failures, available outside standard business hours for urgent situations.
Heating System Repair
Fixes for furnace and heat pump malfunctions, particularly in older residential systems common to Columbia.
Ductwork Replacement
Complete duct installation for homes with aging or damaged HVAC distribution systems, including historic properties.
Drain Line Cleaning
Clearing of condensate and drainage blockages without full system dismantling, as demonstrated in customer reviews.
Preventive Maintenance
Seasonal tune ups designed to extend equipment lifespan and reduce mid summer breakdown risk.
System Diagnostics
Comprehensive testing to identify root causes before recommending specific repairs or component replacements.