I've been working in a haunted insane asylum. The place has been under construction for the past 3-4 years. It's a new 1 million square foot building on the insane asylum grounds. I don't think I believe in ghosts, but now that construction has come to an end, weird stuff has been happening that I cannot explain. Locked doors that require a key or RFID badge to unlock, unlocking and opening by themselves, doors with automatic hydraulic door closers holding themselves open, lights turning on and off by themselves, footsteps, disembodied voices, strange sounds, strange shadows/shapes showing up on CCTV feeds, and inanimate objects moving by themselves. All my coworkers have had something happen to them there they can't explain. All the activity started up about 2-3 months ago once construction finished.
There's a local story, bout an old woman who made embroidered sheets, her last wish on her deathbed was to bring those embroidered sheets with her into the grave. Sadly her degenerate boomer kids thought they could make some shekels by selling those embroidered sheets and put them in a box in the attic in the meantime.
As a punishment for that she came back to haunt their house. Every night they heard from the attic \*thump\*, \*thump\*, \*thump\*, slow steps over the floor, then the box moved and someone was "stealing" those sheets. Once they got up there to check there was no sign of anyone being there.
Now, a demonic entity or poltergeist has a lot stronger energy, but it's pure evil. It trash your haunted house, destroy stuff for seemingly no reason. There's no logic to a demonic entitys behavior other than evil and destruction. A ghost of a person on the other hand has a purpose, it want to finish it's last wish, and if completed it moves on.
Normally you don't get a haunted house unless someone got jewed big time in there moments before death.
I recently rewatched one of my favorite movies. Interstellar. At beginning they all think the bookcase is haunted. Turns out it was the father, from the future, trying to contact himself in the past to change a decision he regrets. Matthew McConaughey was making good movies in early 2010s. True detective first season was extra awesome because of his role.
A lot of haunting incidents also have logical explanations, which people overreact to. The cold touch can be draft and so on.
That said, I know a few confusing stories too which it wouldn't make much sense for a demon to impersonate the ghost. A friendly ghost who helped a man quit smoking by destroying any pack of cigarettes brought into the haunted house while nobody was looking. Why would a demon do that?
I don't know what to believe, but I also ain't taking any chances by trying to communicate with the dead. Too much risk of accidentally summon a demon.