Your questions answered: HVAC FAQs. No matter what your HVAC questions are, the experts at Effective Service Group, LLC. in East Hanover have answers. Whether you have questions about selecting new HVAC equipment to best practices on care and maintenance, we are here to help. Our online FAQs answers give you a quick response for your convenience, but if you want to know more on any topic, don’t hesitate to give us a call at 973-884-0065.