Wasn't there myself (bit far from Herefordshire to Kentucky on short notice) but I've been following reports from that tour closely. A few people on another forum mentioned a really specific thing - a pressure sensation in the body chute area that's apparently been documented across multiple visits over several years now, not just one-off reports.
What I'd want to know from anyone who was there is whether the feeling had any directional quality to it, like did it seem to come from a particular part of the room or was it more ambient. That distinction matters a lot when you're trying to rule out infrasound from the building structure, which old sanatoriums are notorious for generating.
Waverly is one of those locations where the volume of corroborating testimony from completely unconnected visitors is genuinely hard to dismiss. Not saying that proves anything, but pattern recognition across independent accounts is where I always start. Anyone got photos or audio from the visit?