Ghostly effect - cold spot

[Dr Angelface]

Hi,

I'm new to this site so please bear with me!

I have a ghost hunting theme and I'm looking to create a cold spot in a room that will show up on a thermal camera. Does anyone have any ideas on the best way to do this? Thank you in advance rogar-Happy(DBG):

 

[clang]

Drop a plastic bag of ice in the appropriate spot for several minutes, and remove it just before shooting. With some creative choice of plastic bags and placement, you could make a particular cold shape too, if needed.

 

[dwiener]

Try spraying the area with a CO2 fire extinguisher. It will leave frost in the area, but be prepared to shoot quickly as it will not last long.