The average lifespan of a heat pump system can vary greatly depending on when and how it was built, as well as how it was maintained. After 10 years, however, many major components including the accumulator, compressor and reversing valve may break. These are often expensive to replace, so it may be better to buy a entirely new heat pump system at that point.
Residential heat pump systems built in either the 1970s or 1980s are expected to last between 14 and 15 years, if properly maintained and used a standard amount. Technology innovations help newer models last even longer. With regular maintenance, newer models are expected to last up to 20 years with minor repairs.
Even if your residential heat pump system is in functioning condition, there are many benefits of replacing it. For example, it can give you greater efficiency, lowering operating costs. Furthermore, most new models come with warranties.