Heat Pumps "usually" last no more than 5 to 8 years. Same for residential Heat Pump units. I state this for people that are using their unit MORE than 8 months a year. Since Heat Pumps cool and heat, they are run twice as much so they will wear out twice as fast. Now, if you full time and stay in a warm climate, your Heat Pump will still be used as much as a standard AC unit. Since Rv's are usually recreational and NOT full time homes, the AC or HP may last 10 years or more, it all depends on how many days a year the HP is used. Doug