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Frederick Heating & Cooling Service Experts

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Into Big Ones. One Hour Can Help.

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100% Satisfaction Guarantee

$50 OFF Any Repairs Over $300 Or $49 Heating Checkup One Hour Air Conditioning & Heating® of Frederick 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
Free Replacement Estimates Upgrade Today and Save on Your Energy Bills! One Hour Air Conditioning & Heating® of Frederick 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

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Frederick HVAC Company

AC & Heating Repairs You Can Trust

When you need reliable air conditioning and heating services in Frederick from a business you can trust, turn to One Hour Air Conditioning & Heating® of Frederick. We are dedicated to providing top-quality repairs and other services along with the very best customer service. Your comfort is important to us! When you choose One Hour, you get HVAC technicians in Frederick who are extensively trained, experienced, and skilled in repairing, installing, and maintaining heating and air conditioning systems of all makes and models. Enjoy peace of mind with our 100% satisfaction guarantee—we promise we’ll do the job right the first time.

Quality Heating & AC Repair in Frederick

At One Hour Air Conditioning & Heating® of Frederick, we know how frustrating it can be to wait around for a repair technician with nothing more than a block of several hours for a possible arrival window. That frustration goes double when your heater or air conditioner isn’t working properly. Your time is valuable. That’s why we offer an on-time guarantee: Always On Time…Or You Don’t Pay a Dime!® When our friendly and courteous technicians arrive at your home, they’ll get right to work, delivering workmanship that meets or exceeds the highest industry standards. Get in touch with us today for AC maintenance, a furnace inspection, or any other HVAC services you may need.

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

“The most recent visit was to install a whole house dehumidifier. Two technicians were involved. Both were very polite, informative, professional and arrived on time. No debris was left after they ...”
- Clarence L .
“I love the customer focus of One Hour out of Mt. Airy. I was again impressed with the service tech. He was knowledgeable, friendly and was able to explain and answer all of my questions. Also very ...”
- Mary M.
“Brian J. was both professional and courteous. He should serve as a role model for service technicians.”
- Katura W.
“Larson was punctual, professional, provided detailed information regarding the cause of my HVAC unit, and resolved the problem. I am extremely pleased with One Hour's provision of service.”
“Stephen was excellent and very very attentive to our gas furnace and humidifier systems. He spent a lot of time and did a thorough job checking and services our equipment: Communicates well so I ...”
- Timothy S.
“Wonderful customer experience by one hour air conditioning. One hour service was excellent, I was kept informed throughout with text messages, phone calls and information of the plumbing professional ...”
- Cecile C.