So i want to create a container that is part of a system that already actively cools things that touch it. This variable cannot be changed. What i need is a container with some sort of valve that automatically opens up at a certain temperature. Thereby allow air to circulate and reduce the cooling inside. I know there are thermostatic valves but they tend to be heat driven, does anyone know of a material or design that will passively open when its a certain temp too cold and close around a certain temp. I know this is an odd questions, but if anyone will know. You guys are they way. Much appreciated Kyle.