Let Us Make Your Home Feel Like Home

Baltimore 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


  • BBB A+ Rating
  • Air Conditioning Contractors of America
  • Energy Star
  • UWin Black Badge
  • Google Guaranteed Partner
  • PHCC Red Logo
  • Available 24/7 Blue

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.

  • “The technicians who service my heating and air conditioning units have been very professional, clean, on time, and efficient. They have made suggestions to help me get the most out of my unit and to ...”

    - Wanda C | Baltimore,
  • “Rudy was very personable, answered all my questions, very informative and did a great job.”

    - Jean G | Parkville,
  • “Technician came on time, a little bit earlier. He was extremely nice, explained to me what work he will be performing. He also provided advise about the filter, maintenance, temperature settings etc.. ...”

    - Anna R | Baltimore,
  • “I am very pleased with the work that was done 👍 the technician was very professional and courteous”

    - Edward B | Dundalk,
  • “Technician performed maintenance check on the whole home dehumidifier system. The tech was very efficient and professional.”

    - Clarence L | Baltimore,

Baltimore HVAC Repair, Installation & Maintenance

High-Quality Heating & AC Services in Baltimore, MD

Think back to the last time your HVAC required servicing. Did your previous service provider perform the job and educate you about what was done? Did they ensure you understood how to keep your HVAC running smoothly and provide an honest price on the spot? Our team at One Hour Air Conditioning & Heating® of Baltimore will always make sure you’re a part of the repair, installation, or maintenance process. This is how we build your trust in our heating and AC services and make life easier for you.

Our highly trained technicians provide long-lasting repairs and reliable installations that are 100% guaranteed for 2 years from your service date. This means that if something goes wrong or you’re unsatisfied, we’ll come back to your home at no cost to make sure you’re happy. Just as important, we only hire personnel with high standards of ethics. We ensure each of our technicians is background-checked and drug-tested, so you know your technician is trustworthy.

Not only do we employ the best of the best, but we strive to provide that to our customers as well. Each customer is promised on-time arrival or your service is entirely free! We live by our motto, “Always On Time...Or You Don’t Pay A Dime!®” and it conveys how serious we are about providing best-in-class AC repair, installation, and maintenance services every time.

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100% Satisfaction Guaranteed

What Keeps Our Customers Returning to One Hour Air Conditioning & Heating® of Baltimore?

As a local AC and heating company, we focus on helping our Baltimore neighbors with HVAC needs while providing an unforgettable customer service experience. When we provide service, our ultimate goal is to make every customer feel supported each time a technician from our company visits your home. While we carry the name of a nationally recognized company, we are independently owned and operated. As such, every member of our team is a resident of the Baltimore community, and we treat all of our customers like family.

Not only that, but we offer services that keep our neighbors’ lives moving forward. One Hour provides the following services to Baltimore customers:

  • Emergency HVAC services
  • AC repair, replacement, installation, and maintenance
  • Heating repair, installation, and maintenance
  • Furnace installation, repair, and maintenance
  • Duct cleaning, repair, and installation
  • Air quality services
  • Thermostat repair and replacement

All of the services listed above are priced honestly, so you never have to worry about hidden fees or surprises on your bill. We show up, assess the problem, and tell you how much it will cost to repair, replace, or install. This is our One Hour Air Conditioning & Heating® of Baltimore technicians’ StraightForward Pricing® promise, and we stand by it. Every customer is unique in their service needs, and we make it a point to tailor our service and customer experience to fit your needs.

To get started working with an HVAC company that always has your best interest at heart, call us 24/7 at (301) 685-0314 or request an appointment online!

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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 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.
  • What is HVAC?

    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.

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