Why does my sister keep opening all the windows?

Hi I’m just wondering what’s wrong with my sister she keeps opening all the big windows in the house, she keeps them open at night and even when it’s super cold outside like in winter. Why does she do this? I ask her and she said it’s bc she likes/ wants fresh are but I mean for real when it’s like 0 degrees out???... show more Hi I’m just wondering what’s wrong with my sister she keeps opening all the big windows in the house, she keeps them open at night and even when it’s super cold outside like in winter. Why does she do this? I ask her and she said it’s bc she likes/ wants fresh are but I mean for real when it’s like 0 degrees out??? Can someone tell me why she’d be doing this?
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