If you're mashing in a pot, it's best to add some boiling water to bring your temperature up rather than add heat for just the reason you mentioned, and stir well. What works well for me is getting my water and grain to the right temp, then putting the lid on the pot and insulating it as much as I can with blankets, coats, sleeping bags, whatever. Since Saisons like to be mashed low anyhow, losing a few degrees if you start in the mid-upper 140's shouldn't be a big problem.
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