A/C has been PM'd. I was concerned for naught, apparently--tech said the unit is in great shape. He said that what really helped preserve it was the square of fencing--complete with gate--that Dad set up around it after it was installed. Dog urine apparently plays hell with A/C units, corroding the coils. IIRC, Dad learned that lesson when we lived in a rental years ago--the landlord split the cost of a major AC repair with us, and the reason for the repair was corrosion caused by dog urine.

My PSA for the day.