The national average is between 8-12 years. A lot of factors are involved in that particular statistic. As a hvac technician I have personally worked on heat pumps that where over 18 years old. So it is possible to drastically exceed the average. The factors that allow a hvac system of any kind to out live it’s life expectancy are largely related to how it was installed. In 2011 I committed to producing our own personal life expectancy of hvac systems installed by Ocean Air. Although we will never out perform mother nature and her salty air coming off the water; I believe we will soon have enough data to show that through training and a commitment to excellence a heat pump system can average between 14-16 years.