Unfortunately There’s not a place where there is a ventilation. So for the leather chain part, I should keep them hanging out of the dust bag, correct?
Sorry if I was not clear, but I meant that I would not put any part of the bag in the dust bag, that includes the bag itself.
As in, I personally, would not put a bag in its dust bag or the strap or chain in the dust bag.
If you do not have a single place in your house with ventilation, then you are risking your bag with getting mold.
Since you turn the AC on when you get home, that should help, because it's better to have some AC than none.
But it also depends on how often you leave the bag at home. When you bring a bag out to use more, it gets exposed to more air in general and is less likely to get mold.
I'm sorry if I wasn't very helpful, here are a couple of other threads that may help you out better:
https://forum.purseblog.com/threads...uring-summertime.1053382/page-2#post-35213406
https://forum.purseblog.com/threads...-out-of-my-lv-bag.212249/page-5#post-35186969