Air Conditioning Contractors of America

Air Conditioning Contractors of America

ACCA is a group of over 4,000 air conditioning contractors who work together to improve our industry, promote good practices, and keep homes and buildings safe, clean and comfortable.
Energy Star

Energy Star by EPA and DoE

ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices. logo

EPA Lead-Safe Certified Firm

Common renovation, repair, and painting activities that disturb lead-based paint (like sanding, cutting, replacing windows, and more) can create hazardous lead dust and chips which can be harmful to adults and children. But with careful work practices and thorough clean-up, renovations can be done safely. EPA’s Lead Renovation, Repair and Painting Rule (RRP Rule) lowers the risk of lead contamination from home renovation activities
Greater Reston Chamber of Commerce Logo

Greater Reston Chamber of Commerce

One Hour Heating & Air Conditioning is a proud member of the Greater Reston Chamber of Commerce.
Lennox Logo


One Hour Heating & Air Conditioning is an authorized Lennox Dealer. Lennox has set the standard for home comfort, and we continue to push the standard forward with a lineup of more than 60 leading-edge products.
Lennox Premier Dealer

Lennox Premier Dealer

To earn and maintain “Premier” status, Dave Lennox Premier Dealers™ must participate in an independent Customer Satisfaction program. This provides customers with the opportunity to objectively evaluate their performance.
Chamber of Commerce Member

Loudoun County Chamber of Commerce

One Hour Heating & Air Conditioning is a proud member of the Loudoun County Chamber of Commerce.


North American Technician Excellence, Inc., the leading non-profit certification program for technicians in the heating, ventilation, air-conditioning, and refrigeration (HVACR) industry and the only test supported by the entire industry.

National Veteran-Owned Business Association

NaVOBA’s Mission is simple — to create opportunities for all of America’s veteran-owned businesses. More than 3 million men and women who have defended our nation’s freedoms by serving in America’s armed forces have made the choice to start their own small businesses after their military service.

Plumbing-Heating-Cooling Contractor's Association

Dedicated to the advancement and education of the plumbing and HVACR industry for the health, safety, and comfort of society and the protection of the environment. logo

QMC contractors are the most reputable, most professional contractors available to consumers today. One Hour Heating & Air Conditioning is proud to offer free instant quotes on
Rheem Pro Partner Program

Rheem Pro Partner Program

Proud members of the Rheem Pro Partner program. Members of this program are highly trained HVAC professionals who are licensed, professional, and courteous. We offer services ranging from furnace repair to air conditioner maintenance – and everything in between. Rheem Pro Partners are dedicated to always providing exceptional service and workmanship. Every member of the Rheem Pro Partner program strive for complete customer satisfaction with every job.
Service Roundtable

Service Roundtable

The Service Roundtable is a revolutionary organization founded by a collaboration of leading contractors to share information and help other contractors improve their sales, marketing, operations and profitability.
Mitsubishi Electric Diamond Contractor

Mitsubishi Electric Diamond Contractor

As a Mitsubishi Diamond Contractor, Modern Mechanical is qualified by Mitsubishi Electric to find the best personal heating and cooling system solution for your home.


ACHR The NEWS Top 40 Under 40

ACHR The NEWS Top 40 Under 40: 2015, 2016

The premier publication of the Air Conditioning, Heating & Refrigeration industry, The NEWS, named One Hour Heating & Air Conditioning CEO Shawn Mitchell to its “Top 40 Under 40” award list in 2015. In 2016, ACHR The NEWS selected Abel Christopher, our Senior Business Development Manager, as one of its “Top 40 Under 40.”
Best of Home Advisor 2016

Best of Home Advisor: 2016

In order tor receive this award, One Hour Heating & Air Conditioning has demonstrated quality work practices, provided premier service and been a valued resource for homeowners. Only the top pros in our network are honored with the Best of HomeAdvisor award.
LCCC Green Business Challenge Winner

Green Business Challenge Platinum: 2014, 2015, 2016

One Hour Heating & Air Conditioning achieved Platinum Status in the Loudoun County Chamber of Commerce’s Green Business Challenge for 2014, 2015 and 2016. In 2016, we received the prestigious Patricia Trammell Award, named after the Challenge’s founder.
Loudoun Now Loudoun's Favorites

Loudoun Now Loudoun's Favorites: 2016

One Hour Heating & Air Conditioning’s Zach Turner was named as readers’ favorite plumber, while our CEO Shawn Mitchell was picked by readers as their favorite electrician. As a company, we were honored by readers’ selection of us as their favorite HVAC Company.
LTM Best of Loudoun

Loudoun Times-Mirror Best of Loudoun: 2016

One Hour Heating & Air Conditioning was chosen by readers among Loudoun County’s top companies in the areas of Home Improvement, Construction and Real Estate.
US Chamber of Commerce Dream Big Award

United States Chamber of Commerce Dream Big Award: 2016

Modern Mechanical earned Blue-Ribbon Finalist status for the Dream Big Award, the only Loudoun business and one of just four Virginia businesses to do so.
Inc 5000 Fast-Growth

Inc. Magazine 5000 Fast-Growth List: 2014, 2015

Modern Mechanical was listed as one of America’s fastest growing companies, one of just 26 Loudoun-based businesses to achieve that status.
Loudoun County Chamber of Commerce

Loudoun County Chamber of Commerce Awards: 2011, 2012, 2013, 2014

One Hour Heating & Air Conditioning was recognized as Service Business of the Year in 2011. We also were a Finalist for Business of the Year in 2012 and 2013, and won that award in 2014. Our CEO, Shawn Mitchell, won the Chamber’s Entrepreneur of the Year Award in 2013.
Best Places to Work

Washington Business Journal Top 50 Best Places to Work 2012

One Hour Heating & Air Conditioning recently was named one of the top 50 “2012 Best Places to Work” within the Washington, DC, area by the Washington Business Journal. The award is based upon an employee survey conducted by an independent research firm.