Many thanks to Christopher Schaffner for linking in his post below to the Berkeley CBE free online comfort tool at: http://cbe.berkeley.edu/comforttool/

I use the Windows XP operating system, and I wanted to pass along the info that the CBE Comfort Tool online works best in the Chrome browser. Google's Chrome web browser can be downloaded free at:
https://www.google.com/intl/en/chrome/browser/

I couldn't get the CBE Comfort Tool to work at all in Firefox or Internet Explorer 8 on my Windows XP machine at the office. It worked pretty well in Firefox on a different computer (not sure of operating system), but still had a couple oddities on the temperature input options. Those oddities were completely resolved on my Windows XP machine at my office when I downloaded the Chrome web browser and used it to run the Comfort Tool.