Our Certifications Our team at ACS Inc in Metro Atlanta strives to provide the most comprehensive heating and cooling service around. One of the ways we sustain our expertise and continue to build knowledge about HVAC products is by earning industry certifications. Learn more about the certifications our experts have received below. Dave Lennox Premier Dealer™ Dave Lennox Premier Dealers™ are specially trained and independently evaluated on an ongoing basis to offer a higher level of customer service. As a Dave Lennox Premier Dealer™, our team in Metro Atlanta has partnered with Lennox®, a top name in home comfort, to provide some of the most innovative and energy efficient heating and cooling products in the industry. To keep “Premier” status, ACS Inc 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.