Tips on cooling a flat

A friend has just moved into a one bedroom flat in independent living/supervised accommodation
One major problem she has is the heat. It seems to be on in the building 24/7. Even with the heat turned down in her apartment and the window opened it can be like an oven. It’s all part of how the apartments are heated
All I can think of at the moment is an oscillating fan but in a small space I’m thinking it could get quite noisy after a while. Any suggestion as to what to do to make the heat that bit more bearable

Thanks in advance for any advice offered

Kevin