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Frederick Heating & Cooling Service Experts

Don't Let "Small" Problems Turn
Into Big Ones. The One Hour Guys 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 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 Dec 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

“Our tech Larson was amazing!! I am so glad we went with this company!! Originally, we had Michael and Sons come to our house because they had the first available appointment that worked for family. ...”
- Leilani K.
“Larson has consistently provided me with outstanding HVAC service! He is highly professional, competent, and personable. I greatly appreciate his “can do” attitude and willingness to go the extra mile ...”
- Beverly N.
“James was prompt very professional and personable. Just an all around great guy.”
- Marian B.
“Larson did an excellent job on our routine maintenance appointment and was very knowledgeable about what our system will need in the near future. Also was great explaining the process and cost of what ...”
- Kevin B.
“Larson was most professional and respectful, he quickly diagnosed the problem, and informed me of what action needed to take place. He didn't oversell anything or resorted to undue influence as I have ...”
- AK
“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 .