Ok, I dusted the TruePosition OCXO with some freeze spray. Not pretty picture attached... it took around 6 minutes to stabilize. I used just enough spray to lightly frost the can. It would probably help to shield the board from drafts, but probably not wrap it in a polar parka. It did put the unit into holdover. Other holdovers I've seen had a very stable temperature sensor reading. No air conditioning on and a stable room temperature.