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  • Written by
    Max Peterson
  • Fact Checked
  • Updated

Technical issues can be inconvenient for residents who need an air conditioner (AC) repair in O'Fallon, especially in the summer when keeping cool is essential.

Whether it's simple repairs or a full replacement you need, This Old House recommends starting your AC repair company search with these highly-rated O'Fallon providers.

10 Best AC Repair Companies in O'Fallon

Brands are algorithmically curated from a database of local service providers near you. We require a minimum number of Google reviews and average ratings for provider inclusion.

Top Rated Provider
Swiss Air Heating & Cooling, LLC Logo
Top Rated

Swiss Air Heating & Cooling, LLC

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 676 reviews


406 E Wabash St, O'Fallon, MO 63366

(636) 978-7800

www.swissairstl.com
Stay Cool Climate Control Logo

Stay Cool Climate Control

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 556 reviews


407 Sonderen St, O'Fallon, MO 63366

(636) 747-1762

staycool-hvac.com
Faszold Heating and Cooling Logo

Faszold Heating and Cooling

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 816 reviews


1613 E Terra Ln, O'Fallon, MO 63366

(636) 735-7842

www.faszold.com
Hoff Heating & AC Logo

Hoff Heating & AC

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 1308 reviews


1520 Kemmar Ct, O'Fallon, MO 63366

(636) 388-4141

hoffheating.com
Agers Heating & Air Conditioning Logo

Agers Heating & Air Conditioning

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 424 reviews


64 Boone Hills Dr, St Peters, MO 63376

(636) 422-5665

www.callagers.com
No Problem Heating and Cooling Logo

No Problem Heating and Cooling

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 613 reviews


1565 Kisker Rd, St Peters, MO 63304

(636) 400-7776

npmheatingandcooling.com
Jerry Kelly Heating & Air Conditioning Logo

Jerry Kelly Heating & Air Conditioning

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 5359 reviews


4631 N St Peters Pkwy, St Peters, MO 63304

(636) 757-8506

www.jerrykelly.com
Renaud Brothers Heating & Cooling Logo

Renaud Brothers Heating & Cooling

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 354 reviews


3037 Hopewell Rd, Wentzville, MO 63385

(314) 876-8076

renaudbrothershvac.com
Fresh Air Heating & Cooling Logo

Fresh Air Heating & Cooling

5/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 1194 reviews


612 Spirit Valley E Dr, Chesterfield, MO 63005

(636) 224-6106

www.ineedfreshair.com

Ozark Mechanical

4.7/5

Ratings are based on our detailed proprietary methodology and review standards.

Based on 22 reviews


2108 Parkway Dr, St Peters, MO 63376

(636) 317-1234

ozarkmechanical.com

Facts about O'Fallon

  • Average Max Temp Percentile:
    70%
  • August Average Max Temp:
    89°F
  • Climate Zone:
    Mixed Humid
  • Average Energy Cost:
    0.1/kWh
  • Median Year Houses Built:
    1996
  • Average Heat Waves per Year:
    8.15

Common Types of Air Conditioners

By knowing which type of air conditioner you have, you'll feel more empowered in your company search. O'Fallon HVAC contractors have experience with different AC makes and models, and they can customize their skills to your needs.

  • Central AC: These are the most common residential AC systems, offering precise, consistent temperature control. They feature a central unit that cools and purifies outside air and sends it through ducts to various rooms in your home.
  • Portable air conditioners: As the name suggests, portable air conditioners don't require permanent installation or ductwork. Instead, they remove hot air through an exhaust hose connected to a window or nearby vent. They're popular for condos, apartments, or individual rooms.
  • Window ACs: Window air conditioners are a popular choice for O'Fallon apartments, condos, and townhomes. These compact, affordable units are designed for cooling single rooms and small spaces, and they fit snugly in a window frame or dedicated wall slot. Many window air conditioner users install their units without professional assistance, though technicians can still help with maintenance and repairs.
  • Ductless mini-split: Ductless mini-split air conditioners have an outdoor unit and multiple interior units, with no ductwork required. They offer higher energy efficiency, individual room temperature control, and flexible installation options.
  • Split ACs: Split ACs have two main elements: one indoors and one outdoors. They offer peaceful operation, improved energy efficiency, ductwork options, and more cooling capability versus mini-splits.

How to Choose Your O'Fallon AC Repair Service

While you might want to resolve your AC issue quickly, you should do some essential research before hiring a repair service. Take the following steps to ensure you find the best company for your home.

Confirm the Company Is Properly Licensed and Insured

While Missouri licenses some contractors at the state level, it does not for HVAC companies. Local governments can set their own requirements, and we recommend contacting your town hall or county building department for more information.

Many states and cities also require companies to carry liability insurance. Even if your community doesn't require it, we still recommend choosing an insured company. This will protect you if an accident happens or something gets damaged.

Read Customer Reviews

Check customer reviews on the Better Business Bureau (BBB) website for each company you're interested in. The BBB recognizes businesses that handle complaints professionally and honor their warranties.

It's common for even the best AC repair businesses to have both positive and negative reviews. Read each one carefully, and avoid a provider if most reviewers had subpar experiences.

Compare Estimates

Obtain at least three detailed, written estimates from different providers for the best deal. A good estimate should consider additional fees such as permitting costs. You should also ask about the emergency repair process, manufacturer warranties, and installer guarantees.

Frequently Asked Questions about AC Repair in O'Fallon

Sources

FEMA

To share feedback or ask a question about this article, send a note to our Reviews Team at reviewsteam@thisoldhousereviews.com.

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