OK Now I understand what you are trying to invent. What an interesting concept! Temperature is the one thing a spirit can change. It takes too much of a spirit's limited energy to try and move something. But any ghost hunter knows that a spirit can create 'cold spots'. The temperature drops in the area of a spirit. A human spirit has a neutral energy core and they can't 'hold' energies. When a human spirit is trying to manifest itself into our realm it absorbs the energy around itself. Thus creating a 'cold spot'. I really don't know if your idea would work or not. Because it isn't the spirit that is cold, you feel cold because of the energies drawn off that certain area. But Articus I do think you may be on to something not tried yet. Let me know how it works. I am very intrigued by this idea. PS Get a patent!! Happy Hunting My Friend, Tigerkatt