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 Frederick

4.8

(95 reviews)

Heating & Air Conditioning

Services By One Hour

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HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Frederick, 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 Knowledgeable

4.8

(95 reviews)

Jackson Clark

06-12-2025

“Ed was great! Professional and personable. We’ve also noticed a HUGE improvement with customer service when scheduling.”

Lurdes Ramos

08-15-2024

“Brian and his team were incredible professionals. They diagnosed the issue and explained the process on how to fix it throughly. They were also very patient with me because i questioned the situation a lot. I would highly recommend Brian, Larson and Shawn. Brian, you rock. Thank YOU SO much.”

Tanya Brown

08-06-2024

“Brian & Matthew are awesome. As promised they called when they were in route & arrived on time with booties to protect my carpet! The problem was quickly diagnosed & my options presented. Preventative tips were shared & extended an offer for a monthly contract but no hard sales or scare tactics. They even provided me with pics to share with my HOA for possible reimbursement. They even found my drain pipe for my building that I could never find, I live in a condo. One Hour is in my phone for plumbing & ac along with the names of Brian & Matthew for any of my future needs. Highly recommend!”

Deborah Schmid

05-17-2023

“Brian was very Professional and Knowledgeable.”

Sherry Kish

10-28-2022

“I have had One Hour Heating for years, and have never had a bad experience!! Brian has taken care of my maintenance needs before and he’s first rate!! He immediately noticed a couple of things that should have been replaced way before now—took care of it right away. He’s smart, friendly and thorough!”

Darlene Bobo

10-27-2022

“So professional and thorough! Could not be more pleased. Highly recommend”

Denise Cost

10-14-2022

“Wanted an estimate for a digital thermostat installed. Estimate was give and I declined the work at this time as it was more than I was prepared to pay. Technician was very helpful and professional.”

Janet Osherow

09-12-2022

“Brian came an assessed my HVAC and provided a thorough assessment ! Very nice and patient :)”

Sharaya Parker

09-07-2022

“Company was very responsive. Came out in record time. The fastest I have ever experienced for AC repair. The employee was very professional, knowledgeable and courteous.”

William Williams

08-24-2022

“The technician who corrected the problem we were having with our heat pump, Brian Johnson, was exceptionally conscientious and professional. He is an asset to this company's delivery of service.”

Special Offers

Mention these discounts at time of service

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$150

HVAC Inspection and Plumbing Walk Inspection

Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Management reserves the right to modify offers at any given time. Some restrictions may apply.

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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’re 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.