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One Hour Heating and Air Conditioning of Northern VA (aka Modern Mechanical LLC)HVAC Services in Ashburn

One Hour Heating and Air Conditioning of Northern VA (aka Modern Mechanical LLC) specializes in Carrier HVAC installation, repair, and maintenance. Proudly serving Ashburn and the surrounding areas, we deliver reliable, certified HVAC solutions to meet your home's needs. As your local Carrier Factory Authorized Dealer, your satisfaction is our number one priority. That's why we stand behind our work with a 100% satisfaction guarantee. Equipped with NATE-certified technicians, we strive to exceed your expectations, whether performing routine maintenance or installing a new Carrier heating and cooling system.
Book an AppointmentWebsite
phone icon(571) 291-4883
location icon
21730 Red Rum Dr #182
Ashburn VA 20147
538 Google Reviews

Experience and Certifications

  • Carrier Past President's Award Logo

    Past President's Award Winner

    The Carrier President's Award is Carrier's highest dealer honor. We have received the award within the past three years. It recognizes us as a Carrier Factory Authorized Dealer who exemplifies leadership, management, customer satisfaction, expertise, business growth, and operational excellence.
  • Carrier Factory Authorized Dealer Logo

    Factory Authorized Dealer

    As a Carrier Factory Authorized Dealer, we have met Carrier's highest standards for superior skills, service, and we proudly offer a 100% satisfaction guaranteed.
  • NATE Certified Logo

    NATE Dealer

    North American Technician Excellence (NATE) is the leading certification program for HVAC technicians and is the only test supported by the entire industry. We are proud to employ NATE certified technicians.
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HVAC Repair and Installation Services

  • A Carrier dealer discusses air conditioner repair and service with a homeowner

    Air Conditioner Repair & Service

    We specialize in fast, reliable air conditioner repair and service to keep your home cool and comfortable. Whether it’s a minor fix or a major repair, we're here to ensure your AC runs smoothly when you need it most.
    Learn More
  • A couple discusses furnace repair and service with a Carrier dealer

    Furnace Repair & Service

    We provide expert furnace repair and service. Our skilled technicians are ready to quickly diagnose and resolve any issues, keeping your home warm and comfortable year-round.
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  • A Carrier dealer finishes performing HVAC installation

    HVAC System Installation

    We provide expert HVAC installation to keep your home comfortable year-round. Whether you're replacing your current system or installing HVAC for the first time, we'll help you choose the right solution for your needs and handle the installation with precision and care.
    Learn More
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About One Hour Heating and Air Conditioning of Northern VA (aka Modern Mechanical LLC)

One Hour Heating and Air Conditioning of Northern VA (aka Modern Mechanical LLC) in Ashburn, VA

Trusted HVAC Professional in Ashburn

Leave a Review
538 Google Reviews
Facebook Reviews
Carrier.com Reviews
4.56 out of 5(27 reviews)
Great Value and Fantastic service
One Hour heating won my business though competitive bidding and provided an exceptionally smooth installation experience. The install team and subsequent service teams have been highly professional and very competent. Very satisfied.
Nicolas
-
May 14, 2025
Verified Purchase
Expertise:
5
Solve Problems:
5
Service:
5
Hummel Install
Excellent work
Joseph
-
April 22, 2025
Verified Purchase
Expertise:
5
Solve Problems:
5
Service:
5
find another dealer - this dealer has no customer service and haggles customers
Worst customer service. Harasses customer
Mihon
-
April 16, 2024
Verified Purchase
Expertise:
1
Service:
1
Solve Problems:
1
Always great service year after year.
I have many years with this team and it's my second carrier install with them. They are very professional, prompt, and neat. I highly recommend them.
Brian
-
March 12, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great Service
They worked great and went above and beyond
Dario
-
January 24, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Wonderful people to work with
The new heating and air conditioner system that was installed was for my mother. My husband and I have used Modern Mechanical for the past several years and we knew they were the ones to call when my mother's furnace stopped working. Modern Mechanical has always done an excellent job with any service we have needed and we would highly recommend them. Their reps are very kind and respectful and we know they will do the job right.
Daniel
-
January 05, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
New a/c and furnace. Installation and equipment first rate
We are very impressed with Modern Mechanical. They are very businesslike and professional. Communications are excellent.
STEPHEN
-
December 12, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Amazing service and quick turn-around.
Amazing service and extremely knowledgeable
Jamie
-
May 31, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Outstanding Service
Great customer service
Edward
-
May 30, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Poor post sale customer service
At the time of the Carrier 5 Ton Variable Speed Infinity Air Handler FE4ANF006L00, the air handler was defective. I was reluctantly told by the installer that the heat element had a module or resistor that was made for a commercial unit and the system failed system checks. The heat from this air handler would not work until this was corrected. The installer could not get a replacement part for several days. When they arrived and installed the replacement module it had the same issue. Another week went by before a third attempt was made. This time it did work. I had to take three days off from work for this installation. The installer (Modern Mechanical) would do nothing to compensate for my time and aggravation. The salesmen stated that "I wanted to let you know that we did not manufacture these units we just put in what is given to us. We understand things happen, maybe the guy who puts this part together was having a bad day who knows!" I don't consider these statements to be an endorsement for the installer or the manufacturer.
Mark
-
May 15, 2023
Verified Purchase
Expertise:
2
Service:
2
Solve Problems:
2
My experience is average.
I have a broken door because of maintenance guys trying to open left side. The did not resolve my issue.
TIZIANA
-
May 23, 2022
Verified Purchase
Expertise:
4
Service:
3
Superb job
Very professional, courteous, high\-quality installation
SEAN
-
April 03, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
AMAZING Customer Experience
One Hour was amazing from the first contact to the final invoice. Everyone along the way was professional, helpful, and knowledgeable! We had several companies out to provide estimates and by far One Hour ranked above their competitors.
Meghan
-
November 10, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great experience with our installer!
Modern Mechanical did a super job overall and there technicians in particular explained everything and made the process extremely smooth.
Ray
-
September 08, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Installation of an AC/ heating eating Unit at Lansdown Woods.
On time, Efficient, Our building Engineers complemented there work and they cleaned up before they called it a day. Mike R
Jeannie
-
August 11, 2021
Verified Purchase
Expertise:
5
Solve Problems:
5
Kind, knowledgable service
Everyone has been so wonderful with this company. We've only had great experiences. We will certainly return for future needs.
THOMAS
-
May 20, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Innovative Installation
Modern Mechanical performed an installation which required thinking outside the box. They removed the previously installed equipment which had been mounted on concrete blocks and plywood then they correctly installed the Carrier unit.
David
-
May 20, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Nothing but the best....
Nothing but the best.
John
-
May 13, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Quality Work
Daniel \& Ron were very professional and did quality work. I had positive experience and would recommend them.
Dmytro
-
April 01, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Ashamed product
Best quality and affordable cost
Khagendra
-
March 23, 2021
Verified Purchase
Expertise:
4
Service:
4
Solve Problems:
4
Outstanding
Contractor was very professional from the estimate phase, installation phase and the follow\-up visit to correct a minor installation mistake. Both management and tech staff were extremely professional. Well done!!
Ray
-
March 23, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Heating/Cooling Installation
Excellent Work!
Ed
-
March 18, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Major issues with new infinity furnace that took days to resolve while we went without heat. No real communication from anyone.
From what I understand Carrier shipped out a new model of the infinity furnace that we ordered with bad inducer motors. Three days after installation the furnace would turn on, ignite, then turn off. Modern Mechanical came out and replaced the inducer motor 3 times but it kept burning out. After several days without any heat on our main floor, which we had to use multiple electric space heaters to keep from freezing, they replaced the motor with a different brand. Since that point the unit has worked but I have very little confidence in this system and really wish we had gone with a different brand. Plus I am dreading the power bill for running 3 electric space heaters all day. While I understand the issue was a manufacturer defect we were left without heat for several days in the middle of 20\-30 degree days. After our last carrier install didn't go well I was very hesitant to do it again and I can now say for sure I will never buy carrier again. Horrible experience.
Eric
-
February 12, 2021
Verified Purchase
Expertise:
3
Service:
3
Solve Problems:
3
A Professional, Knowedgeable Team
When my a/c broke this summer, I had to replace it quickly during our 90 degree days. Modern Mechanical responded and a new system was installed by their skilled technicians. I would recommend this company.
Gerogia
-
October 07, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great service and product
On time and professional. Would definitely utilize again.
Lance
-
August 07, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great overall experience
Wonderful experience from estimate, to install, to after service. Highly recommend.
Cindy
-
August 06, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
From Start to Finish, a Great Experience
From the sales meeting to installation, One Hour Heating \& Air Conditioning was professional and informative. They did a great job installing the furnace and AC.
Douglas
-
July 16, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
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