Microwaving substrate?

[The Serpent Merchant]

isnt putting something really hot into your freezer a good way to kill your fridge?
I know whenever you cook stuff its usually a good idea to let it cool down to room temp before popping it in the fridge.

I've never had an issue, though this isn't something I'm doing on a regular basis. (I also don't have anything else in the freezer when i do this)

I have heard this in the past but I don't totally see the issue. I can't see how it is any worse that leaving the freezer door open. In both cases the refrigeration system has to kick on... and in the case of the open door it will likely have to run longer. In my eyes it is doing what it is designed to do. The idea that it causes the temperature in the entire fridge to rise by enough to spoil food in the fridge seems crazy to me. It takes a long time for anything to heat up a large volume of air. Certainly longer than it takes for the refrigeration system to kick in, but I guess that would depend on how efficient your fridge is.

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So can you put cypress in the oven without it burning, or could you just soak it?

I've put cypress in the oven. the flash point of most wood is close to 600 degrees. but it will dry out the cypress.