[Gasp0de]

The internet tells me that split-ac systems (basically small heat pumps) have a life expectancy of 10-20 years. That's not too bad, for example an oil-based heating system (as we have in our german basement) also only has a life expectancy of 20 years and has way less moving parts.

[soco]

My oil based system is 45 years old but no part in it is the original one anymore, so with a certain maintenance cost spread over the years you keep it living indefinitely. Does the ship of Theseus concept apply also for heat pumps, or there you have to throw it away after 10 years?