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2x6 all the way.
Althoug it is true you lose a lot of heat out your roof/attic/ceiling, you can't discount the heat loss through the walls. Going to 2x6 is maybe 15% cost increase for better thermal and sound insulation.
Both our house and the newly built guest house have 2x6 walls and we're glad they are. I'm glad I went with the 2x6 walls. In some counties it is required in order to meet certain efficiency thresholds.
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