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Having a remote car starter may be simpler than the system you describe - let the car warm for 5 minutes on a cold day (or cool on a hot day), by the time you get into it the empeg would be warm/cool enough to operate. ...

Hmm, interesting.
But I'd have to modify my Empeg install. Currently the unit is powered on during a car start, then if I've left the player 'off' it will shut down again (sleep mode) after boot up. Otherwise it wakes to the state I've left it in.
I'd have to run power to the empeg from a switchable source- not the ignition controlled source.
... if I understand all of this correctly in the first place, that is...

Sure glad the SF Bay Area doesn't freeze much.