Products and Service You Can Trust at a Fair Price! Since 1994, Hirschberg Mechanical, LLC, has been proud to be a locally owned and family operated business that serves Montgomery County and the surrounding community. With years of experience and unmatched expertise we can help with your residential and commercial HVAC installation and service needs. Our professional installers are all NATE certified technicians. Since opening our doors our goal has been to provide our customers with the highest quality service and products at a fair price.