I'll throw this out for laughs. Think of an 8"h x 8"w x 16" long light gauge steel box with a shoe box style removable lid. Thru this box runs a 4" round mild steel tube. place the contraption a safe distance away and connect one end of the tube to a non combustable flex hose to a vent into the tear. Powered with a tiny 12 volt computer fan fresh air is drawn thru and into the tear.
Now take off the lid and add coals from the campfire on a cool night to warm that tube as the air is drawn thru. Conversely as a chiller just add a bag of ice. Poor mans a/c and heater combo.
Excuse me the nice men in the white coats are here with the net ,
GOTTA GO NOW !
