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(R) technician will walk you through all costs using our Straightforward Pricing(R) Guide so there are never any surprise fees.

How often should I service my HVAC system?

It's ideal to service your cooling system each spring and your heating system each fall to ensure you find small issues before they become big problems.

How often do I need to change my HVAC filter?

Your filter should be changed every one to three months, depending on conditions in your home and your region's climate.

Do you offer purchase financing?

We work built relationships with several lenders to ensure our customers are able to restore comfort in their homes. Ask your technician about your financing options.

What are the advantages of a smart Thermostat?

Smart thermostats learn a household's patterns and adjust heating and cooling according to when a home is occupied, give homeowners the ability to control the thermostat remotely, and enable homeowners to reduce their energy use, saving you money.

HVAC means Heating, Ventilation, and Air Conditioning. HVAC systems refer to air conditioners, furnaces, and any unit that cools indoor spaces during the summer and warm them in the winter. In general, an HVAC system takes in air, heats or cools that air, and blows it into a room or any indoor space. While many homes have separate air conditioning and heating units, others have a heat pump that cools and heats the house. Not only do HVAC systems maintain desired temperatures, but they also improve indoor air quality and regulate humidity levels. But most importantly, these units provide comfort all year round.

What is a SEER Rating?

The SEER (seasonal energy efficiency ratio) is a measure of the efficiency of your heating and cooling system.The higher the SEER rating, the more efficiently a unit operates. The SEER rating of any given unit can range anywhere from 13 to 21.

Bringing Comfort Home

With Expert AC Services

One Hour Air Conditioning & Heating® of Columbia

4.9

(179 reviews)

Heating & Air Conditioning

Services By One Hour

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Two One Hour Heating & Air Conditioning technicians standing confidently in front of a service van.

HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Columbia, MD

When homeowners want a reliable heating or air conditioning system that they don’t have to think about, they call One Hour Heating & Air Conditioning. We are the premier HVAC service provider in the United States for a simple reason: we actually care about your comfort.

At One Hour, we respect you, we respect your time, and, most importantly, we respect the trust that you put in us to keep your home comfortable. It’s why we back all of our work with a 100% customer satisfaction guarantee for two years, and it’s why we’re always on time—guaranteed.

We Have a Reputation

For Being Punctual, Friendly and Knowledgable

4.9

(179 reviews)

Donald Brooks

07-08-2024

“Larson was very technically inclined, knowledgeable of my situation and communicated all details necessary for the job resolution.”

Gary

06-18-2024

“Dwight, Larson and the entire crew performed magnificently installing my new air conditioner. The job took the entire day! On time, polite, experienced, appreciative, describes the entire workers! You cannot go wrong engaging One Hour Air Conditioning— they are great !!!”

Marcus Mingo

06-13-2024

“Fantastic workmanship, extremely knowledgeable. He and his crew did a great job with the installation, I couldn’t be more impressed!”

J Katona

03-05-2024

“We received fantastic service from Larson when he came out to review and perform a quality control inspection on our new HVAC install. He was even able to work thru our outstanding permit inspections with the county for us to get them resolved. Larson was very knowledgeable in the HVAC system mechanics and was so patient in answering our questions. He’s to be commended for pointing out a serious electrical issue with our outside lead wire where the elements had deteriorated the protective covering; which if not corrected, could have been an electrical hazard for us. One Hour should be proud to have such a remarkable employee as Larson!”

Kenneth Williams

01-28-2024

“On time, knowledgeable, personable; and answered all my questions. After making changes to our system, he tested and tested again for good measure. All around GREAT service and experience. I would definitely recommend One Hour Heating and Air Conditioning to anyone looking to replace or upgrade their HVAC equipment.”

Katie Purswell

01-10-2024

“Larson is always professional, thorough, prompt, and kind. He is accurate in his diagnoses and makes sure the customer understands what was wrong, what he did to fix it, and if there is anything you need to do after. Always happy with his work!”

Jennie Wallace

01-09-2024

“Love the way he explains everything thing to me. Polite, professional.”

Jim Weiger

12-23-2023

“Emergency call because our heat stopped working. Young man showed up in about 90 minutes went through and checked everything he could, and even though it wasn’t the best news because have a bad circuit board he was very professional, and courteous.”

Max R.

12-15-2023

“Technician Larson did a great job explaining the condition of my HVAC system, which was purchased new by prior homeowner from One Hour 15 years ago and maintained by them for 11+ years according to maintenance records. Gave me excellent walk through of maintenance, repair and proactive replacement options along with his inspection report, and provided excellent and clear explanations while inspecting too.”

Will Duff

12-14-2023

“Gives a very detailed explanation of the system and possible concerns that may come up with solutions that very in pricing.also with technicians that are easy to talk to with good attitudes. Definitely recommend.”

HVAC Services You Can Count On

Our customers love what we do because we treat them like the neighbors they are to us. While we carry the One Hour name, we are an independently owned and operated business with a personal investment in the local community. We back our work with a 100% satisfaction guarantee, provide StraightForward® pricing guides for your benefit, and will pay you back for being even one minute late to an appointment.

Here For You

When You Need Us Most!

Yellow One Hour Heating & Air Conditioning service van with company branding and slogan.

'Round the Clock Availability

No matter the hour, you can trust One Hour to be there to help you when you get hit with the unexpected.
100% Satisfaction Guarantee

We guarantee our materials, labor, and craftsmanship for up to two years from the date of your service.
StraightForward Pricing® Guide

Before we start any work, we discuss your available options so you know exactly what you are getting and how much it will cost. No hidden fees!
Always On Time…Or You Don’t Pay A Dime!®

We understand your time is valuable, so we promise to arrive at your home within the predetermined time window that you select, or your service call is free.