Wasn't at Pennhurst last weekend but I've been following reports from that site for a while now - it's got a really interesting history of activity, particularly around the older ward buildings.
Curious what specifically you felt? Was it more of a pressure sensation or something more directional, like you were being watched from a particular spot? I ask because those two tend to point toward very different things in my experience.
I had something similar at a Victorian asylum in the East Midlands last year - a kind of heavy, oppressive feeling that would lift completely the moment you stepped outside. Almost like crossing a threshold. My Mel-8704R was spiking intermittently the whole time but nothing I could pin to a specific room.
A few things worth considering for Pennhurst specifically:
Residual vs intelligent hauntings behave very differently in large institutional buildings, Group psychology can amplify perceived experiences, especially in well-known locations, That said, former care facilities with traumatic histories do seem to generate consistent reports over decades, which is harder to dismiss
Did you have any equipment running at the time? Even basic EMF readings would be useful context. And was it just you or did others in your group pick up on it too - and did they describe it the same way independently, before comparing notes?
Really interested to hear more detail on this one.