Stark installed a new hvac and furnace for me in February, 2013. Since then, they have been out twice a year to check out and fine tune the system. We have a service agreement with them that makes this a free service. Every service man that has been out has been very professional, polite, and friendly. They explain everything they do and answer any questions you may have. I also have then change the filter each time they come out (for the cost of the filter). Such a relief for these 65 year old bones not to have to climb into the attic anymore. Great company!