Any suggestions about the best solutions would be greatly appreciated.

Moved house toward the end of last summer. 3 rooms downstairs at the back of the house get full sun all day and get super hot like greenhouses.

We have had some samples sent from https://abodewindowfilms.co.uk/ which I'm told will help reduce the heat and UV but won't make a huge difference unless we go for some dark mirror finish which will make the rooms too dark in winter.

I was just wondering if I've overlooked any other solutions?

Will net curtains help to reflect the heat??