I have an old car without air conditioning. I have a water spray which I spritz around it often. I have a white bath towel on my driver's seat. Good sunglasses. I use vintage linen sheets. There is no other material that keeps your body temperature regulated like linen. A white boat is cool to the touch.....a coloured boat makes you feel you are dancing on hot coals. I wear loose cotton clothing and no underwear. A bra just makes me feel strangulated. I get out of the shower and use a bit of talc (Waitrose which sells Maize powder, sensitive fragrance free.) Lots of sunscreen on my exposed bits. Curtains closed all day and I don't do much....other than go on the computer and make money from listing things on Vinted. As soon as the weather lifts.....I'll be off again. And......I SLOW DOWN and have a nap most afternoons - in bed. The whole caboodle......clothes off, fan on, radio 4 play. One hour suffices, then I am looking forward to something a bit cooler in the evenings.