Inspected heat pump system for home sale checking operation in both heating and cooling mode. Checked all electrical components, refrigerant balance, unit start up, operation, shutdown. Inspection of indoor and outdoor coils and drains. Found Honeywell UV bulb has failed, 16x25x5 filter good for another 6 months minimum. System is from 2016 and is 9 years old. System is r410a refrigerant that has started to be phased out by the industry but expected to still be serviceable for the time being. Expected lifespan for a heat pump in this market is estimated to be 10-15 years but with routine maintenance can extend life expectancy longer.