I too bought Aranet 4 a few months ago. During winter nights we routinely hit 3k-4k in the bedroom by the morning. During summer it never went over 900 due to

I too bought Aranet 4 a few months ago. During winter nights we routinely hit 3k-4k in the bedroom by the morning. During summer it never went over 900 due to open window. Solution, get up in the middle of night to open balcony for a few minutes, drops to under 1k very quickly.