Depends on where your working. My uncle is a delivery driver, and the box truck he drive gets freezing cold... He swears by his plug in one.

http://www.nexusgadgets.com/heating-aluminum-thermos-with-car-adapter-pr-16153.html


~Nate

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95 Honda Shadow ACE 1100.
1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle!
2012 Escape, 'hunter" (5 sp 4cyl)