Our Certifications at Hammack Service Company Our team at Hammack Service Company in Richardson works hard to offer the best heating and cooling service around. One way we maintain our expertise and continue to build knowledge about HVAC products is by earning industry certifications. Find out more about the certifications our professionals have received below. North American Technician Excellence (NATE) NATE is North America’s largest non-profit heating, ventilation, air conditioning and refrigeration certification organization. NATE certified technicians perform outstanding installation and maintenance on your heating and cooling systems. These technicians have verified their knowledge in the HVAC specialty areas including: 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™ Dave Lennox Premier Dealers™ are specially trained and independently evaluated continuously to offer a higher level of customer service. As a Dave Lennox Premier Dealer™, our team in Richardson has partnered with Lennox®, a top name in home comfort, to offer some of the most innovative and energy efficient heating and cooling products in the industry. To keep “Premier” status, Hammack Service Company is involved in an independent Customer Review program that encourages our clients to honestly rate our performance so we can make sure our staff continuously is meeting or exceeding the highest standards for quality service. Better Business Bureau Hammack Service Company is a member of the Better Business Bureau. That means we comply with ethical business behaviors and give trustworthy information to our customers. We have a strong rating and are proud to be part of this organization.