John, the original one apparently had some sort of major malfunction or failure in around 1965 or 1966 and Arkla replaced the outside system under warranty or very little expense for my dad. This one lasted until sometime while I was in college between fall of 1973 and May 1977--probably around 1975 or 1976. This was replaced with a Carrier electric ac with gas furnace. The next door neighbor's lasted long enough such that they replaced it with another gas central system, but didn't have the outside cooling tower any longer. The outside compressor was VERY loud. it was annoying all the way over to our patio. And once the energy crisis hit, our neighbor complained about how high their gas bill and gone up. Amazingly, I saw a real estate listing in the last 10 years for one of the houses in the back of the subdivision that still has the original water cooling tower system. (House would have been originally built in like 1966 to 1968.)
<div>The house across the street from, me, built in like 1978 to 1982, still has the original heat pump. Hard to believe. </div>