Our Certifications We’re passionate about providing the Manassas community with the best heating and cooling service in the area. To do so, we’ve participated in rigorous training to receive the industry certifications you see below. Find out more about our certifications here and give us a call at 703-754-1062 to speak with one of representatives in person. North American Technician Excellence (NATE) NATE is North America’s largest and most respected certification in the heating and cooling industry. NATE certified technicians have demonstrated expertise in the installation, service and maintenance practice of heating and cooling products and can earn recognition in these areas of specialty: Air conditioning Air distribution Heat pumps Gas heating Oil heating Hydronics gas Hydronics oil Ground source heat pump loop installer Senior HVAC Efficiency Analyst Dave Lennox Premier Dealer™ In order to become a Dave Lennox Premier Dealer™, Twin Air LLC in Manassas was trained and is continually independently evaluated to ensure we give an unmatched level of customer service. We’ve partnered with Lennox®, a top company in home comfort, to carry some of the best heating and cooling products in the industry. We keep our Dave Lennox Premier Dealer™ status by participating in an independent Customer Review program. The program gives customers an opportunity to provide honest feedback and rate the quality of our service, which keeps us accountable for offering high quality work and customer service at all times. SunSource® Solar-Ready Dealer Designation Earning SunSource Solar-Ready Dealer designation from Lennox means that we’ve gone through training on solar-ready products, sales and tech. We also understand Manassas utility requirements for solar installations and rebates, and we’re familiar with local grid interconnectivity abilities. And, we’ve begun or completed solar training and certifications so we can provide you with a quick and easy purchase and installation process.