You could get this mosquito net for your room's door:

https://www.amazon.com/Magnetic-Screen-Door-Partition-Friendly/dp/B074TWKVQB/ref=sr_1_7?crid=2QSHC2P0WQLVF&keywords=magnetic+mosquito+net+for+door&qid=1666732928&qu=eyJxc2MiOiI0LjY2IiwicXNhIjoiMy45MiIsInFzcCI6IjMuMzkifQ%3D%3D&sprefix=magnetic+mosqu%2Caps%2C174&sr=8-7

In my country you can find them also in cinese stores and it's very simple to install, as it attaches to velcro strips that you stick to the door frame. Best of luck for this winter