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5 Best AC Repair Services in O'Fallon, MO

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Written By Max Peterson | Last Updated: February 05, 2024

Technical issues can be inconvenient for residents who need an air conditioner (AC) repair in O'Fallon, especially in the summertime when keeping cool is essential. Whether you need routine maintenance, emergency repairs, or total AC replacement, we'll highlight the best AC repair in O'Fallon so you can get your home back to a comfortable temperature quickly.

Top AC Repair Companies in O'Fallon, MO

Stay Cool Climate Control Logo

Stay Cool Climate Control

Based on 380 customer reviews.

Services Offered

Ac Installation Furnace Installation Filtration Maintenance Furnace Repair Indoor Air Quality Inspection Zoning Systems Emergency Services Ac Repair Filters Ductless


  • Free quote
  • Reliable customer support
  • Clear pricing policy
407 Sonderen St, O'Fallon, MO 636-747-1762 staycool-hvac.com
Faszold Heating and Cooling Logo

Faszold Heating and Cooling

Based on 738 customer reviews.

Services Offered

Ventilation Ductless Maintenance Indoor Air Quality Inspection Furnace Installation Ac Repair Filtration


  • Free quote
  • Clear pricing policy
  • Informative resources
1613 E Terra Ln, O'Fallon, MO 636-735-7842 faszold.com
Hoff Heating & AC Logo

Hoff Heating & AC

Based on 12,000 customer reviews.

Services Offered

Furnace Repair Ventilation Maintenance Indoor Air Quality Ductless Filtration Ac Installation Ac Repair Geothermal Heating Furnace Installation


  • Informative resources
  • Reliable customer support
  • Clear pricing policy
1520 Kemmar Ct, O'Fallon, MO 636-388-4141 hoffheating.com
Agers Heating & Air Conditioning Logo

Agers Heating & Air Conditioning

Based on 373 customer reviews.

Services Offered

Emergency Services Filtration Furnace Installation Ductless Furnace Repair Ac Repair Indoor Air Quality Maintenance


  • Informative resources
  • Reliable customer support
  • Clear pricing policy
64 Boone Hills Dr, St Peters, MO 636-422-5665 callagers.com

More Local Hvac Companies

Superior Heating | Cooling | Plumbing

User Reviews: 5/5 

101 Stag Industrial Blvd
Lake St Louis, MO 63367

No Problem Heating and Cooling

User Reviews: 5/5 

1565 Kisker Rd
St Peters, MO 63304

Jerry Kelly Heating & Air Conditioning

User Reviews: 5/5 

4631 N St Peters Pkwy
St Peters, MO 63304

Renaud Brothers Heating & Cooling

User Reviews: 5/5 

3037 Hopewell Rd
Wentzville, MO 63385

Fresh Air Heating & Cooling

User Reviews: 5/5 

612 Spirit Valley E Dr
Chesterfield, MO 63005

KirbnJays Heating & Cooling

User Reviews: 4.7/5 

674 Whispering Willow Dr
O'Fallon, MO 63366

Elite Heating and Cooling

User Reviews: 4.7/5 

108 Hamilton Industrial Ct
Wentzville, MO 63385


User Reviews: 4.7/5 

3803 William Dr
St Charles, MO 63304

AAA Heating & Cooling

User Reviews: 4.7/5 

407 E Pearce Blvd Ste A
Wentzville, MO 63385

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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Facts about O'Fallon
Average Max Temp Percentile: 69.9%
August Average Max Temp: 88.9°F
Climate Zone: Mixed-Humid
Average Energy Cost: $0.1/kWh
Median Year Houses Built: 1996
Average Heat Waves per Year: 8.15

Expert Tips By

This Old House empowers homeowners with the knowledge and tools they need to tackle various projects and navigate the complexities of homeownership.

Common Types of Air Conditioners

By understanding which type of air conditioner you have, you'll feel more empowered in your provider search. O'Fallon HVAC technicians 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 air from outside, purifies it, and sends it through ducts to different rooms in your home.
  • Portable air conditioners: As the name suggests, portable ACs 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 townhomes, apartments, and condos. These compact, affordable units are designed for cooling small spaces and single rooms, and they fit snugly in a window frame or dedicated wall slot. Many window-mounted AC users deploy their units without professional assistance, though technicians can still help with maintenance and repairs.
  • Ductless mini-split: Ductless mini-splits have an exterior unit and one or more indoor units, with no ductwork required. They offer higher energy efficiency, flexible installation options, and individual room temperature control.
  • Split ACs: Split ACs have two main elements: one inside and one outside. They offer silent operation, improved energy efficiency, ductwork options, and more cooling capability versus mini-splits.

How to Choose Your O'Fallon AC Repair Service

You likely want a quick solution for your air conditioner's problem. However, before recruiting a repair company, it's important to carefully investigate how well it fits your home's needs. Here are a few essential steps to follow.

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.

You should also check a company has sufficient liability insurance coverage, even if your state doesn't require it. Choosing an insured company will protect you if accidents happen during work.

Read Customer Reviews

Find customer reviews on the Better Business Bureau (BBB) website for each company you're interested in. The BBB recognizes businesses that respond to complaints effectively 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 value. A good estimate should include additional fees such as permitting costs. You should also ask about manufacturer warranties, installer guarantees, and the emergency repair process.

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Frequently Asked Questions About AC Repair in O'Fallon

What's the cost of an AC repair job in O'Fallon?

Your AC repair costs will hinge on your system's make and model and the malfunctioning part. A basic repair job like sorting out a thermostat might cost $150–$250, whereas a more intricate fix like swapping out the compressor will be more expensive.

See the average costs for common AC repairs below.

Common RepairAverage Cost
Clogged air filter$62–$165
Electrical circuits$200–$250
Drainage problems$100–$150
Refrigerant leak$400–$1500
Frozen condenser coils$1,236–$3,707
Fan or air blower issues$150–$200
Compressor replacement$600–$1,565

What are some signs that I should call an HVAC repair company?

Here are a few of the frequent AC issues you might face: It's best to contact a professional HVAC technician if you encounter any of these problems.

What do I do if my AC is running but not cooling?

If your air conditioner is running but not cooling, a contractor will usually check the condenser coil first. Normally, the outdoor unit fans draw air into the coil so the system can extract heat energy from your home. Clearing the blockage might be all that's necessary to get your AC back on track.

Is hiring an HVAC company better than doing the repair on my own?

Yes, it's better to get a new air conditioner professionally installed. Most units have complex wiring and piping that can confuse even a seasoned do-it-yourselfer. They also use chemical coolants that could pose serious safety risks if they spill or leak. With their training and equipment, the right technician will set you up for success.

How long is my air conditioner's lifespan? When should I consider a replacement?

With adequate maintenance, your air conditioner's lifespan could be 10-15 years. Remember that parts often become obsolete as time goes on. If your servicer can't find a critical replacement part, you might need to consider installing a new AC.

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