Connect With Us
Please leave your information below and we will be in contact soon.
Harford County, MD
Harford County, MD
Bringing Comfort Home
Harford County HVAC Services
One Hour Air Conditioning & Heating® of Harford County
4.8
Heating, AC & Furnace Repairs in Harford County, MD
When homeowners want a reliable heating or air conditioning system that they don’t have to think about, they call One Hour Heating & Air Conditioning. We are the premier HVAC service provider in the United States for a simple reason: we actually care about your comfort.
At One Hour, we respect you, we respect your time, and, most importantly, we respect the trust that you put in us to keep your home comfortable. It’s why we back all of our work with a 100% customer satisfaction guarantee for two years, and it’s why we’re always on time—guaranteed.
We Have a Reputation
For Being Punctual, Friendly and Knowledgeable
4.8
Julien Martin
02-16-2026
“Damon completed the heating service and he was very knowledgeable and experienced with the system. He did a great job detailing what needed to be done and offered helpful tips to keep the system maintained. Great job.”
Eric S
02-08-2026
“The technician seem very competent and able to quickly get to the issue. He arrived on time and was respectful. He didn't try to BS me.”
Carolyn Allen
12-31-2025
“I was very impressed with Tyler Henson. He was professional, courteous and extremely knowledgeable. He took the time to clearly explain all of my options, along with the potential outcomes of each and gave me the opportunity to think through my decision without pressure. Once I made my choice he move quickly and efficiently into the next phase of the process. I truly felt that Tyler‘s priority was finding the best solution for me, not focusing on the company’s bottom line, I would highly recommend him to anyone needing work done on their systems. Allen Powell, the sales representative also came out the same day after Tyler’s service call.He was thorough, professional and very knowledgeable. He clearly explained our system options, took accurate measurements and patiently answered all of our questions. Once we decided he quickly handled the paperwork and scheduled installation within days. We were highly impressed with Allen Powell‘s presentation and would recommend his services.”
Tom Hartzell
12-30-2025
“Tyler was here for an inspection (included in my monthly membership) on my System. Very thorough and took his time. Easily explained recommendations.”
David Dawson
12-24-2025
“They worked hard and did a fine job, on Christmas eve.”
Edward Haywood
12-13-2025
“On time and very professional.”
Matthew Trout
12-11-2025
“Brandon Summers has been to the house a few times. He’s always kind and very knowledgeable. I’m happy to have heat again.”
Patricia Padgett
11-25-2025
“Joshua was polite and explained his findings about my HVAC system in detail.”
Dave Tart
11-05-2025
“The technicians were amazing for our install! They were quiet and clean and respectful the whole day and showed me everything they did with explanations after they were done. Thank you!”
Frank Giachini
11-01-2025
“Thorough and courteous. Explained my problem and provided an option.”
Our customers love what we do because we treat them like the neighbors they are to us. While we carry the One Hour name, we’re an independently owned and operated business with a personal investment in the local community. We back our work with a 100% satisfaction guarantee, provide StraightForward® pricing guides for your benefit, and will pay you back for being even one minute late to an appointment.
Here For You
When You Need Us Most!
'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.
Financing Available!
Prioritize your comfort without fronting the entire bill on day 1 – contact us today to learn more about financing options.
Hours of Operation
We are available 24/7 to take your call for emergencies. For all other services, our appointment hours are:
Monday
24 hours
Tuesday
24 hours
Wednesday
24 hours
Thursday
24 hours
Friday
24 hours
Saturday
24 hours
Sunday
24 hours
Authority Brands is the leading provider of in-home services, building brands that support the success of franchisees as well as better the lives of the homeowners we serve and the people we employ.
