Purchased a furnace for home. Written guarantee for 10 years on all parts. After 8 years heat exchanger and blower both failed to work. When I tried to get him to honour his warranty for parts and I pay labor, he refused saying the warranty had lapsed. I told him that I would go elsewhere. His partner than called me, and had the nerve to verbally attack me, I had never spoke with this man before. Originally okay experience turned awful.