Well, we dont have any ac. We have the heating ducts. but thats no good. But, there is only a blanket infront of it, and my window is open all the way with a blanket over it but opened at the bottom a little. And every once in a while i open it and run the fan through it. im hoping this will be enough ventilation. i have a homemade co2 pump out of a bottle with 1 cup of sugar, and 1/2 tps of yeast. and the rest wth water in a 12 oz soda bottle. So i pump a bit of it in thru the cap. and then i open the front of the blanket and let the fan in for a minute .

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