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I’m also thinking about air circulation, which I guess is important for temperature regulation too.
Yes, good thinking. That's why I made a small window
on the backside of the house, and also will come another one, larger of 2m long by 80cm (with a small side part to open). On the front wall apart from the door will be also 2 small windows that can be opened and create an air flow.
I was also thinking to use the chimney as an air conditioner tool. There's a way to use it in the summer to bring fresh air (especially in the night) inside.