I've had mine in the 20's. It pretty much just keeps the chill out down in
those low temps. It does not get toasty warm with the top up. It also runs
24/7 at that temperature so expect either the propane or battery (most
likely) to run out.  The Propex seems happiest in the 40's and above.

Bryan

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike Collum
Sent: Wednesday, January 30, 2008 8:16 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Propex and outside temperature

How low can the outside temperature go (outside westy propane tank) and
a propex furnace, at or near sea level, still operate?

Mike