upon my arrival I performed a six month check up on one heat pump system. I flushed and treated the water removal system, washed the condenser coil using water, cleaned and treated the electrical cabinet with electrical insecticide, then verified system safety and performance. I found the system to be operating the best it possibly can at this time given its age and the restriction on the indoor heat transfer media coil. Given the coil is beginning to deteriorate a cleaning is not recommended due to the potential of further damage happening to the heat transfer media coil. I spoke with the customer about my concerns and recommended a consultation to upgrade the equipment to something more efficient. Customer would like the office to reach out and schedule for the comfort specialist to come out.