Connect With Us
Please leave your information below and we will be in contact soon.
Northern Virginia, VA
Northern Virginia, VA
Heating, AC & Furnace Repairs in Northern Virginia, VA
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.
Hours of Operation
We are available 24/7 to take your call for emergencies. For all other services, our appointment hours are:
Monday
9:00 AM - 5:00 PM
Tuesday
9:00 AM - 5:00 PM
Wednesday
9:00 AM - 5:00 PM
Thursday
9:00 AM - 5:00 PM
Friday
9:00 AM - 5:00 PM
Saturday
Closed
Sunday
Closed
HVAC Services Have Great Guarantees
Our customers love what we do because we treat them like the neighbors they are to us. While we carry the One Hour name, were 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.
Mason is an excellent technician. His assessment and remediation of my system were excellent and greatly appreciated. His diligence also provided the best solutions for the best performance of my HVAC while ensuring the best value for my dollar! Thank you!
Our technician, Gabe, was very friendly and seemed very knowledgeable. He quickly identified the problem and explained various options. Glad I called Modern Mechanical to troubleshoot our A/C problem.
Ken and Ludwig did a fantastic job installing a gas line for a customer on a project in Sterling. Highly recommend using them.
Chase and Jaime were very helpful and efficient technicians. I would recommend them to anyone looking to have their hvac repaired and serviced
Today I received service from Craig Moss of Modern Mechanical and he was AMAZING!!! Craig was professional, punctual, AND trustworthy. I say he’s trustworthy because as a first time homebuyer, I got three different quotes and Craig was the only person to teach me about my AC system, the home maintenance plan, and how to smartly save and invest for a newer system a few years from now. AND he SAVED me a ton of money!!!💰…Thank you Craig!🙂🤗 One Hour is the only HVAC service that I will be using from now on!😎
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.
Expert Tips
Learn From Our HVAC Experts
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.
Book online with us 24/7
