When I was a kid and I lived in my parents beach house for a year I remember how much I hated the HVAC system.
The only reason I have such a clear memory of the HVAC system is because the AC unit was so loud.
There was a window AC unit in my room and it would scare me every night. The AC unit would make a bunch of weird sounds and I always forgot that it was just the AC unit. Usually I would end up sleeping downstairs on the couch, but there was no AC at all down there so it would get very hot. I was happier being hot and sleeping with no AC than to hear the scary sounds. My parents have sold the beach house since I was a kid and I am sure it has a better HVAC system than it used to! I will never get a window AC unit again because of that experience. I know that some of the window AC units are a little bit better, but I still really don’t like them. I like to be able to open the window when I want, and you can’t do that if you have an air conditioner in the window! The one nice thing about a window AC unit is how cheap they are to run, fix and buy. My HVAC system now costs the same as about 15 window AC units, but it also works a lot better. I have central air so I don’t have quite as much control as I would with the window AC unit, but I am really happy about my switch.