Our Certifications Our team at Effective Service Group, LLC. in East Hanover works hard to provide the most comprehensive heating and cooling service around. The primary way we maintain our expertise and continue to expand our knowledge of HVAC products is by earning industry certifications. Learn more about the certifications our professionals have received below. Better Business Bureau Effective Service Group, LLC. is a member of the Better Business Bureau. That means we comply with ethical business behaviors and share trustworthy information with our customers. We have a good rating and are proud to be part of this organization.