The fan vents (or intakes?) out the back of your neck just outside the shirt if I understand correctly. I could see it maybe being useful if it takes that air and pulls it over the hot side of the peltier might be beneficial. It doesent need to do much more than a couple degrees. Ive moved to a very hot and humid country and im very interested in something like this or maybe that vest. My biggest issue though is just lack of airflow in a lot of places. Theres not enough room for more fans