Assertion: heat pump's system | /r/HasProperty | operational
Facets:
value: after 25–30 years with routine maintenance
type: OTHER
Source sentences:
text: Good data on system lifespan is not yet available because the technology is too recent, but many early systems are still operational today after 25–30 years with routine maintenance.
text: New cooling systems have been dependable and efficient, as well as operating quieter!
text: We calculated the payback period for (a) customers whose existing equipment failed and who needed a new system anyway and (b) customers whose existing systems were still operational and were kept as supplemental heating for the coldest days of the year.