You can get by without a vent for the cold days and nights, but in direct sun those plastic houses get extremely hot inside, even if the air is cool. Consider making a closable vent (maybe using Velcro or something) so that you can open it up when it is sunny and above 10C outside, but keep it closed otherwise.
Also, those units aren't exactly air-tight so you will experience some air exchange with a small fan.
Oh yea, if it snows you might want to go out and keep it cleaned off every couple of inches - they are not the most rigid units in the world.
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