I wouldn't worry too much about heat damage. The empeg has an operating range of 5 degrees to 55 degrees celsius (that would
be 41 degrees to 131 degrees Fahrenheit in "hard drive" mode; and a range of -20 degrees to +60 degrees celsius (-4 to +140 F)
in radio-only mode. The empeg has temperature monitoring circuitry that will prevent the hard drives from spinning up if these
temperature limits are exceeded. I don't know if these circuits will prevent the radio from working.

I live in Alaska, so my problem is the reverse of yours, but possibly more easily solved. I will have to work out some sort of external
heat source to warm my unit up from as cold as -50 degrees celsius (-58F) when the car is parked outside on a cold day.

There Ain't No Such Thing As A Free Lunch