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Frederick Heating & Cooling Experts

Always On Time...

  • ‘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.

Get the Best Service Around

Our Happy Customers

Our Comfort Specialists are available to help, no matter the time of day. If you're in need of emergency services, we've got you covered 24/7.

  • “Larson gave excellent customer service, was very pleasant and professional, as well as sharing expertise and recommendations.”

    - R. Larkin | Frederick,
  • “I appreciate the professionalism of the company in providing a thorough assessment and walking me through step by step. Thank you”

    - Gaby R. | Urbana,
  • “Very professional and courteous. Explained the entire process and expectations. I would recommend to friends and family.”

    - Adeyemi J. | Frederick City,
  • “My AC suddenly stopped working and the house got real hot. I called One Hour Air conditioning, and they were able to squeeze me in for an appointment. They troubleshooted the issue and immediately ...”

    - Elias V | Braddock Heights,
  • “Great technician (Larson)! Very professional and helped me understand everything! Katie”

    - Katie S. | Frederick City, MD

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.

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100% Satisfaction Guaranteed

Special Offers

  • One Hour Air Conditioning & Heating® of Frederick Free Replacement Estimates Upgrade Today and Save on Your Energy Bills! One Hour Air Conditioning & Heating® of Frederick Expires: Dec 31, 2022 Print

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.
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Frequently Asked Questions

  • 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 with several lending partners 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.
  • 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.

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