You cannot keep your system from breaking down, but you can avoid it by having your system maintained on a yearly basis. Their experts can give your unit a tune-up when necessary. They also offer PLUS service plans, which can save you money in two ways. First, when your system is properly maintained, it will run as efficiently as possible, which will use less energy and is great for the environment. Second, when your system is maintained properly, it will reduce the amount of expensive repairs that your furnace will need.  Most people would rather spend their hard earned money on something besides high energy bills and frequent heating repair.