Tech arrived at a service call. It was very cold outside. The customer mentioned a noise when the outside system was functioning. Upon inspection, the fan motor was fatigued and squealing during operation. The contactor was scorched and audibly buzzing. The pipe temp refrigerant test indicated that the system was low on refrigerant. The filter was clean the blower area and coil was very dirty. There was growth present. The evaporator coil was rusted. There was no observed water safety. The customer was informed of recommendations today. Due to age, condition, price of repairs and presence of R22; it is recommended that the customer speak with a Comfort Advisor about upgrading to something more reliable with warranties behind it. The outside system was left in the off position. The heat strips were heating upon departure.