It's not very important after primary. Temperature and dry hop time have a negative correlation, so the lower the temp, the longer you will need to dry hop to achieve the same results.
I personally use the brewjacket to finish up fermentation. After primary I crash out the ales by dropping the temp into the 30s or 40s and let the yeast and other solids fall out of suspension to clarify the beer. I'll let it sit for a few days then keg or bottle and skip secondary altogether unless I'm aging a sour or lagering.