For years I had assumed I had seen The Legend of Hell House, because in my mind I conflated it with The Haunting (based of course on the book The Haunting of Hill House), and The House on Haunted Hill. And, in a way, I was right! Because its similarities to both of those films can't be denied.
It probably most resembles The Haunting, with a set-up that includes two psychics...picked to live in a haunted house...where they stop being polite...and start getting real. In this case the two psychics are played by Roddy McDowell and Pamela Franklin, with Franklin really going full force into the part. She ain't afraid of no ghosts! Even if they sexually assault her and leave her bruised and beaten! (OK. I'll admit that bit was a little off-putting.)
The house is spooky, there's a cat (always a bonus), and the ending is really kind of wild. It's definitely a good addition to any haunted house movie marathon, (although it doesn't knock The Haunting off the top of that list for me).
The Legend of Hell House is available to rent via several streaming services.