Our elementary school librarian ran a VHS movie for us one afternoon in the '80s. It could have been a TV special or even 8mm film. It was full-colour late-70s/early-80s cinematography. It had a Disney-type feel and it was not violent, so it was probably meant for kids.
It was likely a kids' film. It felt Hollywood spooky. It featured two young characters exploring an old Victorian house who encountered a glowing red orb or sphere inside. It floated around room to room glowing red. I remember it at the top of the stairs. I specifically remember that when the kids entered the house it was a calm, clear night. However, when they looked through a window near the stairwell it was storming outside. The kids were not supposed to be in the house.
It wasn't the Phantasm or House, as I was only about 12 at the time attending Catholic school.