This is how I’ve been working to solve the winter problem. Roughly 2 inch insulation on sides and top but still using Langstroth frames. Didn’t do the bottom last year and that’s why I think 2/3 of the nucs didn’t make it. #bees #grownostr
Discussion
Does the insulation need to be removed in summer or maybe cause they like it warm it's even an advantage in summer?
Several have said it’s fine in the summer too. I didn’t see any temperature issues myself. This is the temp chart for an insulated nuc for last summer and the bees kept it pretty reasonable.

Makes sense. Did you have any humidity problems with the nucs?
I didn’t see any moisture problems but this year we have humidity as well as temp sensors. Over the winter, it showed humidity was under control.
Very nice, if you had a lightning wallet connected I would zap this
Might try horizontal hives… also, maybe stuff with raw wool instead of foam board if possible. If it gets really cold where you are, might also want much deeper frames.