Came across some interesting pattents that are still held by Stratasys regarding 3d printing and heated chambers.
Heated chamber to be between 70 and 90 deg C.
http://www.prsnlz.me/blogs/daniel-oconnors-blog/stratasys-patents-that-could-improve-makerbots-3D-printers/
http://www.google.com/patents?id=F8sQAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false