Not sure how to handle tenant request

[Robin W.]

I just dropped 15k on a bathroom remodel and replacing all weathered wood windows with new vinyl double pain windows on a duplex building. I then had two AC units installed for an incoming tenant without drilling into the frames as that would void any warranty on the new windows. But now the tenant is requesting I have them "screwed into the window" otherwise someone could "push them in and jump into the apartment." We never had an issue with robberies and I don't really want to void the window warranties and ruin this brand new purchase. But he has a point.. I think? How would you proceed?

[Marcia Maynard]

I would not screw the AC unit into the window frame. It would not deter a determined thief, as they would just bust through and cause even more damage to the window and frame. I would instead install a stick to prevent the window from sliding open. Also, go to a locksmith store and purchase the devices that can be installed on windows to lock them without needing to drill into the frame. If the area is in a bad area of town, do as @Ray Slack says.