We've recently moved to a new house, we've been in flats before so all on one floor and ground floor so I haven't had this problem before and I hope someone will know what to do! Just before lockdown we moved to a new house, terraced and with front garden/ kitchen and open plan living room downstairs. Upstairs we have our large bedroom- hallway- bathroom- toilet (the bathroom and toilet have no windows)- large bedroom for children. The only windows upstairs are in our room and in the kids' room. The problem is, even with every window open in both our rooms all day the whole upstairs is hot. Hotter than a teapot. I've cooled the downstairs by having everything open, all windows and doors and we even leave the front door open for a blow through for most of the day and it cools the downstairs really nicely. The trouble is as the kids go to bed at 7/7.30 it's so so hot and stuffy up there. We run a fan for them but then I can't sleep for worrying about fire. After it rained this evening I thought it was lovely and cool upstairs because the temperature dropped downstairs but as I went up the heat hit me in the face about halfway up.
Any ideas as to how to cool the upstairs bearing in mind every window in the whole house is open already? Plus the back door and the front door as well during the day.