I have seen the program.  It is mostly two fellows sitting in a room with an infrared camera saying, "If there is a presence here, reveal yourself."  Eventually, a cat runs through the room or a furnace kicks on.  Then, the hosts flip out and run like nancy girls out of the room. 

My kid sister produced more ghosts with her Ouijia board at sleep overs than these guys do. 

I've seen the show many times. I'm echo what Penn & Teller Bullshit had to say about ghost hunting. Even if they can find temperature or EMF spikes in a room, what does this data mean? They haven't established a connection between the phenomena they observe and the concepts they want to support. The only reason we're barking up this tree is that some people, who claim to see ghosts, associate them with cold spots in the room. Not a good basis for research, and not science.