Certifications at Effective Service Group, LLC. We’re passionate about providing the East Hanover community with the finest heating and cooling service possible. To help us do this, we’ve gone through rigorous training to receive the industry certifications you see below. Find out more about our certifications here and give us a buzz at 973-884-0065 to speak directly with our representatives. Better Business Bureau Effective Service Group, LLC. is a member of the Better Business Bureau, meaning we respect ethical business practices and disclose reliable information with our customers. We have a excellent rating and are proud to be part of this organization.