O'Brien Heating & Cooling is an HVAC company for Waukegan, Illinois and surrounding areas. We provide quality, honest service. Since 1963, we've arrived at homes and businesses promptly to resolve all their energy issues. We're sales, service, and installation specialists with the insurance and licenses necessary to guarantee outstanding results. We handle gas system installations, energy efficient system installations, and complete service on furnaces, air conditioners, boilers, humidifiers, and air cleaners. Emergency service is available when needed for both residential and commercial properties. Call us today for your free estimate!