The equivalent of reading the top answer on Google isn’t installing an HVAC system. It’s turning on the AC. I bet most people who do that don’t know much about how they work. If your landlord got the AC replaced with something “new and better” but it still blew cold when you turned it on, I doubt most people do anything different than what they were already doing unless they experienced bad results.
Did things suddenly become worse for those types of things around 2014? If that was the cause, I feel like you’d see a bump up in 2008 with the great recession.