We moved in to our house in 2002 and wanted to continue the service the homeowner before us had chosen. Tiger Services was the one that put the complete system in. I've signed up for the maintenance plan in 2002 as well and do so each year. If my HVAC needs a part I get a discount because I'm on the maintenance plan. Tiger Service keeps my HVAC in tip top shape. They check it out before it gets cold and before the hot weather gets here. Tiger Service Technicians are nice and polite to my wife and I. Last but not least I even get a courtesy phone call that the technician is on the way to my home.