In a previous article, "Marco Leon" mleon(at)optonline.net said:
It's the Beeper Box: http://www.reiffpreheat.com/Beeper%20Box%20pg%201.htm

Have you looked into the ThermoCube? It turns on when the temperature drops
below a certain threshhold. Sporty's sell it I believe.

I don't want to heat up the airplane every day if I only fly once in a
week.



--
Paul Tomblin http://xcski.com/blogs/pt/
"The only thing that interferes with my learning is my education."
-- Albert Einstein.