Yes. Which is why laws require brackets, etc. But landlords have to allow window air conditioners (installed properly, etc) because old people can die in the heat. They're less likely to want to accept liability for something not required by law. Air Conditioners also injure firefighters because they tend to fall during fires:

https://nypost.com/2026/01/06/us-news/nyc-bravest-hit-in-hea...