You actually don't want insane insulation. Alaska is wet, and if you trap condensation and add heat for warmth, you get mold.
Yes, you do want high insulation, and also good air tightness.
* https://buildingscience.com/documents/insights/bsi-031-build...
* https://buildingscience.com/documents/insights/bsi-001-the-p...
* https://cchrc.org/wp-content/uploads/media/arctic_wall2013.p...
You want a very good building envelope and you control inside conditions through mechanical means. You control condensation dehumidifiers.
You actually don't want insane insulation. Alaska is wet, and if you trap condensation and add heat for warmth, you get mold.