Lots of reasons for that though, that aren’t necessarily climate related. Most people moving to forced air systems from water based systems makes it easier for central A/C even if you don’t need it. On some systems it’s now more expensive to get it without it since the central HVAC systems are designed for the entire country.
Window units are also less expensive in relation to inflation now that last are made in China, Thailand, and Vietnam.
I will say the climate related need is that it’s warmer and humid more often than it was a decade ago, regardless of what anyone feels is the cause.