The Name to Trust for All Heating, Cooling, and Indoor Air Quality Needs With more than 40 years in the heating and cooling business, Corcoran and Harnist Heating and Air is dedicated to providing the best possible service for you and your family. You can count on us to provide you with a system and solution that fits your family’s unique needs and since we’ve installed many systems in this area, we’ve earned a reputation for doing the job right the first time. To assure your satisfaction, we start by asking questions. If we don’t provide what you need and want, we’re not doing our job. Second, we work with the leader in home heating and cooling equipment, Carrier.