Many things in my house do not even rely upon electricity and I use very small amounts of compressed air, thereby getting by with smaller compressors, made in China but yet have a crankcase of oil versus air cooled non-lubricated ones that WILL fail as plastic fan parts break every year..
The most impressive special effect has a woman in a white dress appearing in one corner of the wine cellar, then floating across that room and vanishing! My customers have all been Very impressed when they see her do these things.
Now if only I knew how to do this?
There are some advantages to buying a "Haunted", haunted house!
This "effect" has been seen down there since at least 1925, a year after my Father was born!