I have had this experiment work many times in locations with reported paranormal activity. It appears that spirits are able to manipulate temperature, creating a decrease in temperature not throughout an entire room, but in small area. I don't consider any dips less than 8 degrees as significant, and I prefer the temperature change to be over 10 degrees. This experiment was interesting. We did this on an interior wall. All windows and doors were shut, and there was no air conditioning nor heating unit operating at the time. 3 temperature gauges sitting on the coffee table continued to read in the low 70's throughout the experiment. It was only my handheld IR thermometer that showed a drop of temperature of 12.5 degrees from start to finish.