It is our goal to reward our loyal customers. You earn $50 credit for each year you purchase a service plan, up to a total of $500 during your lifetime as our customer. You can use a portion of these credits toward the purchase of a variety of "oil" heating and cooling equipment. (The figures below show how much can be used for any one item.) Credits are not transferable. They have value only as a credit toward the following equipment purchased from the F.C. Haab Company by its customers.