I'm having company for dinner, and it is so hot while prepping?

quick cold shower.
lots of cold water.
open your windows for some nice draft.
limit the food to cold meals (salads, noodle/potatoe salad with marinated fish, sushi)

Run cold water over your wrists for a quick cool down.

Cool water over your wrists and inside elbows.
Soak a towel in cold water, wring it out, and put it around your neck. 2 so you can change them out quickly.

Put a bucket filled with cold water beneath your table, so you can soak your feet while chopping. A damp, frozen towel is very cooling, even more so than a wet one.

Thanks all. I took 10 minutes to lie down in the air-conditioned bedroom and felt much better. Dinner was successful!