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.

Columbia, MD

HVAC Service you can count on

4.8

(198 reviews)

Heating & Air Conditioning

Services By One Hour

View More Services

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

View More FAQs

View All FAQs

Our Happy Customers

Reviews of Columbia

4.8

(198 reviews)

Michael T

11-26-2025

“Josh from One Hour did a great job today. He cleaned my coils, made sure all systems were operating properly, set my Humidifier up (new system for us so we didn't know how to turn it on), inspected the outside compressor, and answered my many questions. I will definitely request Josh for my next scheduled visit!”

Sherry Kish

11-21-2025

“Damon was fantastic! You’re very lucky to have him working for you! He’s friendly, knowledgeable, professional—just all around great!!!”

Sue Vidal

11-08-2025

“Tyler was helpful, professional, friendly and overall great guy! We were very happy with our service and with Tyler!!”

Alex Floyd

10-28-2025

“Damon was professional in his approach at performing the heating season check up. He took his time to review the history of the system and checking his notes for the service call. Friendly and outgoing, Damon easily answered all questions while providing his excellent knowledge of system performance and recommendations. Damon is another valued asset for the company.”

10-21-2025

“Tyler helped up out very quickly and he was professional and informative.”

William Evans

10-11-2025

“I am having a new HVAC system installed. Mr.Allen Powell was very knowledgeable and made sure I fully understood the various choices available to me. I feel good about my decision and look forward to having my new HVAC.”

William Evans

10-11-2025

“I was having a problem with my heating. Brandon was excellent and walked me through the process of troubleshooting my system. I have 12+year system and will make a decision to repair or replace the system. I trust One Hour will give me a great choice.”

William Evans

10-11-2025

“Chris and Christopher installed a new HVAC system for my home. Both technicians were professional and knowledgeable. The HVAC looks excellent. I've been with ONE Hour 13 years and I continue to be satisfied with their service. I will recommend One Hour to anyone who needs HVAC services.”

Penni Vera

10-09-2025

“Michael our technician was polite, knowledgeable and efficient. He explained everything in terms that were easily understood. I would recommend your services to anyone.”

ed tyler

08-18-2025

“My tech Majdi was awesome.”

Servicing your entire home

Part of the Authority Brands Family

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.