Thankfully the heat dropped to a comfortable 18-21C hes way happier now. I didnt have ice cubes but I put water on his ear tips and paw pads at night. Also strategically placed squashy pillws beneath or next to draughty points, worked ok. I have come up with an idea for the top opening windows in my own bedroom so they can be open but no danger to him when Im out. Jali board cut to size and secured. Thanks for help and maybe this is useful for anyone else with an indoor kitty:

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