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2021 Crosstrek: searching for USB or AC fan to cool rear seat


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We were bummed that the 2021 Crosstrek doesn't come with rear cooling. We take our dog on road trips, and were hoping to have the rear AC.
But we loved the vehicle so we bought it anyway.

I'm thinking about buying a USB or AC fan to cool the back area. I was thinking of hooking the fan up to the AC outlet that's in the armrest storage area.

Question: is it bad for the vehicle's battery to use those AC adapters? I heard it could drain the battery after awhile.

Thanks for any tips!

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