FYI: I set this thing outside last night. The temperature was about 13 degrees F this morning when I cracked it open, and I found the insides to be slightly warm, no condensation. I had sealed it the day before when it was about 40F. This is the actual installation: http://www.rof.net/yp/alphaone/activities/electronics/sowap/ Once I obtain some silica gel, I should be fine, at least until summer. I'll re- evaluate the situation when the weather warms up some. I like this phase-change suggestion, and I should explore it later on as the temperature swings become more pronounced. Will let you know how it works out. JB -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads