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My Atik camera with the Sony 694 chip is very clean. It still produces decent images if only running at -10C. I usually run at -20C but have a library of darks and bias files done at -10 just in case. The Atik can often produce pretty good images without any darks included in the preprocessing at -20. My other camera is an SBIG STT-8300 with the KAF 8300 chip and that is still pretty noisy at -35, so I never use that on warm nights.
As with all things it is the result that matters. If you need to run at a higher temp, but results are still acceptable, then that is a good result.
Malcolm
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