I have a buddy who uses these: http://www.cupojoes.com/cgi-bin/spgm...;srch=NA&amp;i tem=humpl10and it seems to work well. They also have a built in humidifier (in case you ever get a drought in <?:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City w:st="&#111;n"><st1:place w:st="&#111;n">Seattle</st1:place></st1:City> ;-))