Our Certifications at ACS Inc We’re passionate about providing the Metro Atlanta community with the best heating and cooling service around. To do so, we’ve gone through rigorous training to receive the industry certifications you see below. Discover more about our certifications here and give us a shout at 770-939-7500 to speak with one of representatives in person. Dave Lennox Premier Dealer™ To receive status as a Dave Lennox Premier Dealer™, ACS Inc in Metro Atlanta was trained and is routinely independently evaluated to ensure we offer an unmatched level of customer service. We’ve partnered with Lennox®, a top company in home comfort, to carry some of the best HVAC products in the industry. We keep our Dave Lennox Premier Dealer™ status by participating in an independent Customer Review program. The program encourages customers provide honest feedback and ratings on the quality of our service and keeps us accountable for performing high quality work and customer service at all times.