For anyone thinking of building like a 12x14 size back yard shed/office for year round ues, look long and hard and do the math on the cost difference in using 2x4 for the exterior wall framing vs 2x6 (like a real house). Lots of cheap shed plans default to 2x4, unfortunately.

Compared to the total cost of the project, using 2x6 and correspondingly thicker standard pink fiberglass insulation (R-13 to R-15 for a 3.5" cavity vs R-19 to R-21 for a 5.5" cavity) the cost difference is not a lot.