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Interesting. I never thought whether just cabin climate control would regulate battery temps. I doubt that it would.


The car has to be physically on, or charging. The 120 volt charge option should work well since on really hot days, it likely won't even keep up with cooling, and therefore not really add any charge.


If you're gone for 3 weeks in the heat, leave the battery at about 20%-30% and plugged in with a 120 volt / 12 amp charger on a timer that comes on every day between noon and 6pm (or whenever the latent ambient heat hits the battery).


You'll need an external timer so that you can stop the charge, too, every day. The issue with the car "sleeping" applies, and you'll need to wake it up with the proximity signal.


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