I understand you're saying. I guess "cold" is a relative term, since I usually don't find it enjoyable to drive my cars if it's colder than 40-45'F and windy (the wind usually kills the fun). I don't see myself need an "r/c" fix in 30'F weather but I'll keep in mind about covering the heatsink if that ever happens. Yet another "interesting" aspect of nitro. ...Hmm... I wonder if my IB4200 is charged....