I need help from all my DIY'ers on here. My "snake room" (which is basically a glorified utility closet) is about 5 1/2 by 7 1/2. Sounds kinda small but it does the job and keeps all my snakes isolated from the rest of the animals and kids in the house. In the winter I use an oil filled radiator on a lux thermostat and it works wonderfully keeping the ambient temp in the room between 80 and 82.

The problem I have is in the summer. That room has NO ventilation in it at all. So in the summer I have to watch the temp in the room and when it gets around 84-85 I have to crack the door to let some of the heat out. It's still "locked" when I do this with an eye hook and come Paracord at the top of the door, it's cracked about 5-6 inches which let's a lot of the heat out. The kids still can't get in there without me so there's no worry there whatsoever. My big worry is my cats, IF they went in there I don't want them stressing any of the reptiles out and making my and their lives a nightmare.

So my question is what would be the best way to vent that room without cutting a whole in the ceiling and roof, or an exterior wall for a window? Any help would be very much appreciated!