Yeah it's frustrating, especially revisiting objects that were imaged in winter only to find the mass of noise in summer. For myself I find I have to stick to the bright stuff in summer and leave the faint objects for cooler weather.
I also found a CLS filter to make things worse in some cases when at 30C. The reason was the higher ISO / longer subs needed for the CLS overran the image with noise. But then I was using a Pentax K-x which totally dies in the heat.
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