If the furnace is relatively new and has a hiccup, furnace repair services might save you some dollars. But if the furnace system repair costs the same or more than half the price of a new one, a furnace replacement might be the right choice. Remember, gas furnace repair and oil furnace repair costs can differ, and older models might make your bills climb. Talking with trusted furnace repair companies will always help you decide between a furnace replacement or repair.