I prefer my oil in shatter form, rather than wax, so I purge at 115F and -29.5F in thin films, instead of making muffins. I prefer it that way, because it is fully purged and more floral before I pump away all the additional
terpenes while processing it further into a wax.
Even though the wax is still floral, the terpene stench of the vacuum pump oil greives me when I change it after making a wax.
I use either a vacuum desiccator with a hot plate inside, a heated vacuum pot, or a vacuum oven, so as to keep the temperature a constant temperature. It is hard to get repeatable results, without uniform varibles.
When I do make muffins for others on request, I warm up the shatter and roll it into a ball, before blowing it up into a muffin and letting it sit in a warm vacuum chamber until it turns.
I lower the temperature to between 90 and 100F, so that the muffin stays inflated and doesn't slump before it turns to a hydrate. I deflate it and ball it up again or throttle the vacuum pressure using the backfill valve to control it, if it starts to over inflate.