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That doesn't seem to be much of a problem as the point is not to actually cool you, but to apply a temperature change of a fraction of a degree to a tiny part of skin to trick you into feeling colder.

When I stick a AA battery on a Peltier, to work out which side is which on unmarked unit, it actually does "feel" very cold really quickly. Hot side is obviously also very hot, very quickly.

I'd think it's more likely that the hot side is going to be the problem. Dissipating that heat without something like liquid cooling and active fans.

Hmmm.... and all that waste heat from the Peltier junctions go into /heating/ the room -- making it a little warmer for everyone else.