People often describe the presence of ghosts through feeling a sudden drop in temperature, or a “[[xref:http://www.iprfinc.com/brian50.html|cold spot|iprfinc.com]].” They use [[xref:http://video.syfy.com/shows/ghosthunters/steves_gear_guide/#////shows/ghosthunters/steves_gear_guide/digital-thermometer/v110459 |digital thermometers|digital thermometer]] to locate areas with a dropped temperature or to monitor a sudden decrease in ambient temperature. The team of paranormal investigators on the SyFy show Ghost Hunters
explains cold spots as ghosts drawing the heat out of the air so that they can manifest. Or it could just be the natural convection process of hot and cold air separating.
Image: Courtesy of [[xref:http://www.paranormalresearchtools.com/thermos.html|Paranormal Research Tools|Paranormal Research Tools]]