I performed a single heating maintenance on a 2018 heat pump system. I thoroughly examined the electrical, cleanliness, filter, and safeties. I spoke with the homeowner about preventative options the need to be addressed. The evaporator coil is oxidized resulting in a higher cost to operate the system, the compressor is amping at 90% of its allotted capacity and will cause irreversible damage to the internals, the ducts are in need of cleaning, and we highly advise adding surge protection to the inside and outdoor equipment.