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Jo. I have not built a cooler box, using cold fingers instead. TEC modules, to be efficient, like minimal temp differential between hot and cold side, when powered. Not to be confused with the sensor ambient and cooled differential. Therefore, if you use your TEC as a heater, cooling will be limited, as a result. I don't know how effective defogging will be.
However, if you locate your heatsink near the area to be heated, or connected to it, you can take advantage of the natural inefficiency of the system and/or trade off a liitle in the way of cooling performance. Rather than using the entire box heated.
My latest effort limits the degree of cooling, to a out 20, in order to avoid damage to the camera internals. To do this, I use a smaller heatsink. I am happy to achieve a working differential of 12. Reducing dark noise by 4 - half for every 6 degrees or twice the noise /6C.
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