Automatic temperature controlled jacket that will keep you cool on hot days and warm on cold days
You may not know this but it can get temperature extremes here in Australia. And I like riding my motor bike as often as possible, with the least amount of clothing as possible (no I don't ride in my birthday suit before you ask!).
The temperature range can go from -10 to 40 deg C in one trip, so I think having this jacket take care of my comfort would be great!
I have proven the concept by having the peltier cool or heat water in some tubing on the floor of my shed. Not pretty but it works.
Next I need to replace my homemade water tank with a proper CPU copper water block.