As I understand it the lower temp( much around 65 and lower ) really affects the anodizing process. I know this because of tests I have done. A part done at 65 degrees or less will take much less dye than a part done a 70 for the same time. I am not sure if it's because the size of the pores or the lack of anodizing because of the low temp. Most likely both as higher temps make bigger pores. I'm not sure about the lower temp making a thicker layer... I guess if you left the piece going for long enough it would. I use a 100 watt fish tank heater myself it does ok heating up my anodizing tank( around 4 gallons or so) it does take awhile though.. like a few hours. I turn it on the night before and it is good to go my morning. I have also brought the tank into the house too but have been trying to keep it in the shop.Just my 2 cents.
Later,
Tim
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