I brewed something like a Black IPA today (hoppy and dark). I ferment in carboys in a chest freezer with an external temperature control. It is frigid today, and the garage where the chest freezer is around 40 degrees F. My wort seemed to end up at about 64 degrees. I was planning on fermenting at 68 degrees using WLP001. I made a large starter, which is at high krausen. If I picth at 64 degrees, I know that fermentation will make the temperature rise, and its not supposed to be as cold in the next few days. So I should have no problem getting up to 68 degrees (which is the lower end of the recommendation for this yeast).
My question is that I'm not sure how quickly I should let the temperature rise. I know that yeast can emit temperature shock proteins if they have too big of a daily temperature swing. So I'm thinking of letting it get to 66 the first day, then 68 the second day. Should I instead just let it get up to 68 quicker? should I ramp it up slower?