Inground Project zone 4-5

Use cheap plywood cause it’s affordable yes. The foam insulation is tightly fitted on the walls so next season I’m able to take it all apart. The wood will be preserved when I tarp everything. I haven’t done it yet but before it rains I will tarp everything.  

This idea is also a great idea if your tree is potted and you have no storage. Build a insulated box and have the coiled heat running. The heat will reflect off the insulated walls and keep everything at temperature. I’ll be doing this for my cousin because he has absolutely no heated storage.

Im confident you’ll love this idea

I use this thermostat controller from Amazon 
ans the heated pipe coil is available on Amazon aswell. 

https://www.amazon.ca/dp/B0CNT52YLD...CSJ3XDF8PQP1932N1&starsLeft=1&skipTwisterOG=1
 
Vitto visible controls throughout the winter 2 in of gravel and 1-in cement for rodent vole mole and whoever would like to get in your warm coffin during the winter. Everything you've done is a genius idea. Including having portable coffins for those with no storage space. As so many of our members are overwhelmed looking for insulated space. Plus with portable coffins no winter Shuffle, and no spring Shuffle. Just warm, and safe from freezing all winter long
 
My trees did well for anything covered at-20F Last winter, all exposed wood died. But on the other hand my trees this year saw a random night of +24F last week and a couple have been killed to the ground. The level of dormancy being the biggest factor as opposed to the temperature itself.
 
If you need it to be warmer:

I recently researched attic insulation- air sealing was one of the biggest recommendations for keeping out cold air. You could spray foam the interior joints then use some kind of insulation strip for the lid. You could also use seam tape where the board foam joint is. It may not make much of a difference, but I might consider having the radiant barrier face inward since that's designed to keep heat from penetrating into an interior space. Having the foil face inward would better reflect any electrical heat. Finally, you could wrap the whole thing with a black tarp.

just my 2 pesos
 
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