You don't need windows for either Ob or Toolshed, and they are a security risk point. Although I'd agree, ventilation is probably a must in Aust. How about a protected grilled vent near the roof line ? Heat rises and it will be a natural draft. I don't care what anyone says, I have yet to find a shed that didn't leak air through dozens of wee gaps. But you could insulate the roof and north facing wall if it is an issue.
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