What does the One Hour mean in your company name?

The 'One Hour' in our company name indicates our guarantee to be at your home in the predetermined window quoted when you set your appointment. If we do not show up within that window, your service call fee is waived. 1. Express Appointment: This is an appointment that is scheduled during a specified one-hour time slot. You are promised that a technician will arrive at your home within this one-hour time window. You will also receive a call when the technician is en route to your home. 2. Reserved Appointment: This is an appointment that is scheduled during a specified, two-hour time slot. You are promised that a technician will arrive at your home within this two-hour time window. You will also receive a call when the technician is en route to your home. 3. Standard Appointment: This is an appointment that is scheduled during a specified four-hour time slot. You are promised that a technician will arrive at your home within this four-hour time window. You will also receive a call when the technician is en route to your home. 4. Stand-By Appointment: This appointment is for overflow situations. This appointment will not have a specified time. You will receive a call when the technician is en route to your home. 5. Emergency Appointment: This appointment is for an unspecified time after normal business hours Monday – Saturday and all day on Sundays/Holidays. Calls are dispatched in the same order they are received. You will also receive a call when the technician is en route to your home.

Do you service emergencies after-hours?

Yes, we offer emergency services 24-hours a day, year-round.

How much will my service cost?

The size and complexity of your HVAC issue will determine the cost. Because our trained, licensed HVAC technicians must diagnose the issue before we are able to quote you an accurate cost, we require an appointment to be set to complete a diagnostic on your system. Once the diagnostic is complete, your One Hour® technician will walk you through all costs using our Straightforward Pricing® Guide so there are never any surprise fees.

Chesterfield, MO

HVAC Service you can count on

5.0

(55 reviews)

Heating & Air Conditioning

Services By One Hour

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HVAC Service Near Me
—Available 24 Hours

One Hour Heating & Air Conditioning understands that heating and air conditioning issues create uncomfortable living situations — especially when temperatures outside are extreme. Luckily, our customer specialists are on standby 24/7 to fix your urgent issues. Whether you need HVAC installation, repair, or maintenance, our HVAC service experts are ready to help.

Emergency HVAC Services

We offer 24-hour emergency HVAC services – even on weekends and holidays – to ensure you have professional support when you need it most. Arriving with service trucks stocked full of specialty parts and tools, we have the equipment needed to fix many HVAC problems on the spot. In the case that additional parts are needed, rest assured – we will do everything in our power to handle your HVAC emergency quickly and efficiently.

Give our team a call today or contact us online to request your same-day HVAC service.

Air Conditioning

Whether you need an emergency replacement, regular maintenance, or installation services, our qualified technicians have the experience and technological resources to get any HVAC job done correctly. We utilize the latest tools, products, and techniques to stay up to date with cutting-edge changes in the industry.

AC Repair

At One Hour Heating & Air Conditioning, our HVAC technicians service all major AC brands and models. Our AC repair team can fix:

Poorly insulated ductwork
Power supply breakdowns
Defective fans or thermostats
Refrigerant leaks
Frozen condenser coils
Blocked condensation drainage
AC short-cycling (turning on and off too quickly)

After inspection, we will provide a detailed estimate.

AC Installation & Replacement

There are many telltale signs that an HVAC unit might need to be replaced. If an HVAC unit is over 10-years old, smells terrible, blows warm air, or produces subpar results as energy bills keep rising, give us a call!

AC Maintenance

For optimal performance, AC units require many parts to work seamlessly together. A single problem can cause a ripple effect of issues. This is why spotting minor malfunctions is critical. With regular maintenance visits, we can ensure your HVAC system is operating smoothly and efficiently. Consider joining our Club Membership for additional customer benefits.

HVAC Services

Common Questions

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Our Happy Customers

Reviews of West County

5.0

(55 reviews)

Sandy

10-31-2025

“Farrell, is fantastic and can be trusted. Today I left the door open for him, he did his work and reported back to me. This company is excellent. I recommend them.”

Dorothy Harris

10-30-2025

“Excellent customer service, always looks and explains what issue is and determines how he is going to resolve it. Goes the extra mile to ensure job is thoroughly and quickly done the right way the first time. I am left very satisfied with that l will have no problems after he leaves. Highly recommended.”

Robert Babel

10-30-2025

“Outstanding service! We had our regular maintenance visit to clean and service our HVAC unit at a house we recently moved into. The technician found and cleaned out a birds nest that was blocking the intake vent from outside, and then discovered a wiring issue from the original installation that needed to be redone to make the unit run more efficiently. And there was no additional charge for the work. All included in the maintenance plan. We have been using this company for the past three years at our previous house and I would highly recommend them!”

Derek Hirst

10-26-2025

“Farrel did the job, courteously and efficiently. He's great!”

John Barack

10-24-2025

“Ferrel arrived on time. We have a dog who barks and growls at strangers. Ferrel took time with the dog treating him and greeting him to help the dog to relax. Nice!”

David Corelli

10-22-2025

“Ferrell has worked on my systems several times and does a good thorough job.”

Mike Farmer

10-16-2025

“All good”

Patricia Chuffo

10-16-2025

“Always punctual, thorough, professional and helpful, THANK YOU!”

Alice Miller

10-15-2025

“We've been customers of Dunn One Hour Heating & Air for almost 6 years. Nothing but excellent service. All of the personnel are wonderful to work with.”

Cherial Rekart

10-08-2025

“My technician, Farrell, was very knowledgeable and explained everything. My furnace is pretty old and may need replacing. He gave me some options for replacing now or waiting awhile. I have two furnaces and I felt confident I am in good hands. Thanks again, Farrell!”

Servicing your entire home

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Authority Brands is the leading provider of in-home services, building brands that support the success of franchisees as well as better the lives of the homeowners we serve and the people we employ.