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Not qualified to answer really (i.e. very new to all this) but am noticing as I'm getting darks with my DSLR (using a battery eliminator and surrounding the camera with ice bricks) that although the ambient temp makes a difference it's also the time delay between shots that significantly helps in keeping temps down. I have no idea how long the sensor need to rest to fully cool down but a 2 minute rest on my 40D seems to make it reasonably stable (differences of 2-4 degrees across 50 300s darks). Longer rest I think would still be better but at present it's all guess work.
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