Wow taking my stuff in would be such a pain in the ass, then u get them in your car, and YOURE frozen....
I have to deal with this pain in the ass everyday, I havent seen frost, but you have to keep your volume low(no higher than 15 out of 60 for me) and pump that heat, in like 10 minutes your HU should be warmed up a little from running, along with your amp, plus the warmth from the heater, and you can gradually turn it up. The longer your car is parked outiside, the more time it will take to warm up.
One of my classes is a 12 minute drive, so I just start turning it up and I get there, then I have to park for two hours and drive another 15 minutes, in which I cant listen to my system any louder because i have to repeat the process.
Lets me down, I just want to hear beats...