Back in the early 1980s as a service manager for a major HVAC distributor, I had been asked by an apartment management company to look at a problem it was having with a fairly-new A/C unit it had purchased.
And they pointed out to me that this garden-apartment community still had most of its 20-year-old original units, which were mostly still operating quite well. So, why couldn’t the new unit survive its first two years of operation? Good question!