I was thinking of buying a very small air conditioner to be powered by a deep cell battery system, but the only place I can vent it is out a window which takes away from stealth. Even if I have a sunroof, the noise may attract attention. I saw online that you can buy a small portable dehumidifier for around $60. Maybe the dehumidifier and a fan is all I need? This may help take care of condensation for when its hot and cold out, but I am not sure.