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Mount Airy Heating & Cooling Service Experts

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Into Big Ones. One Hour Can Help.

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100% Satisfaction Guarantee

Free Replacement Estimates Upgrade Today and Save on Your Energy Bills! One Hour Air Conditioning & Heating® of Mount Airy 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. Expires Jan 31, 2021
$50 OFF Any Repairs Over $300 Or $49 Heating Checkup One Hour Air Conditioning & Heating® of Mount Airy Work to be completed and fully paid during the period of January 25th thru 31st. Not applicable to oil heat systems. Not to be combined with any other offers. Only valid for One Hour Air Conditioning & Heating locations west of the Chesapeake Bay, MD. Valid Jan 25 thru 31, 2021. Expires Jan 31, 2021

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Mount Airy HVAC Company

Heating & AC Experts Serving Frederick County, Montgomery County & Beyond

One Hour Air Conditioning & Heating® of Mount Airy has a long history serving the residents of Mount Airy, Frederick, Gaithersburg, and throughout the Washington DC area. We’ve been in business since 1949 and turned our focus to HVAC service in 1993. Our team has the same goal that we started with: making customers happy and comfortable through excellent heating and AC service. Every member of our team undergoes extensive training and is well equipped to solve any HVAC problem. Our vehicles are so well-stocked with parts that we can finish most jobs in one visit!

Why Maryland Customers Love Our HVAC Services

Even though we operate under the name of a nationally-recognized HVAC company, we’re a proud local business based in Mount Airy. Our team back all their jobs with amazing guarantees that make sure we’re always on time, and we always do the job right the first time. To be as transparent as possible, we also have a StraightForward® pricing guide so you’ll know the costs of all our heating and AC services before we perform them.

For local HVAC repair, installation, and maintenance need in Mount Airy, Frederick, or beyond, call the experienced team from One Hour Air Conditioning & Heating® of Mount Airy right now!

Always On Time... Or You Don't
Pay A Dime

‘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.
We Love What We Do
Our trained Comfort Specialists are friendly,
knowledgeable, and genuinely love helping people.

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We Have A Reputation For Being Punctual, Friendly, and Knowledgeable

“Jonathan P. is the consummate professional. He wore his mask, completely explained the work being performed, and answered questions. I was very pleased with the service he provided.”
“We've used One Hour Air Conditioning & Heating for a number of years now and have always been satisfied with the work performed by their service personnel. This is the first time that Larson has ...”
- Robert W.
“Austin and team were extremely professional and efficient. We’ve been using One Hour for many years and have always been very satisfied with the service. The team always does a great job and ...”
- Vernessa P.
“I am very happy with this company, I look forward to doing many years of business with them. So far each employee has treated my home as if it was their own. In this day and age that kind of pride in ...”
- Josh P.
“Air conditioning was out. Called and they came out a few hours later. Quick diagnosis and solution.”
- Christopher A.
“Jonatan and Osman were an excellent team to install the steam humidifier on a recently installed HVAC system. The two are friendly, professional, and thorough. They respected the home environment. ...”
- Brian D.