The chair is interesting, as I lived in a house prior to this one, where very similar things would happen. Never a chair, but other similar things. If there were ever a thread, I could go into details.
One problem I had in that house, was retaining house sitters. This was at a time when I used to travel to Europe for extended periods for work, and rather than put my dog in a kennel for weeks at a time, I'd always hire a house sitter. I'd never tell them any of the history of the place, not wanting to scare them off. But they each had their own unnerving experiences there, so I was never able to convince any one of them to sign on for a second time.

More than once, I returned to find the keys on the kitchen table, with a note saying they'll never stay in that house again.
Only two things I'll say about that house, before appologizing for the off-topic tangent:
1. I got used to it after the first several months. After that, I was able to see the frightened reactions of others as more amusing, than anything else. Yeah, there were all sorts of noises at night, and stuff moved around without explanation, but it never hurt anyone.
2. Most of the phenomena stopped when I got rid of my dog. I've heard poltergeist phenomenon are usually attached to a person or pet, so I guess this is common. My last several years in that house were much more "quiet" than my first few years there.
I never bothered to get out any instruments to measure temperature, E-field, B-flux, etc. Never saw much point in all of that.
Our current house is 150 years older (1730's), and is quiet. The oldest house we ever owned was 1690's, and also quiet. The "noisy" one was ca.1880, nearly new by comparison, when I bought it in the 1990's. Go figure!