Peltier coolers are best case approximately 60% efficient, its hard to find good numbers as there are so many variables involved. So you would need at least a 230 watt one to cool a gpu at all and almost tripling power usage and heat output. I tried to cool a 45 watt low power cpu with a 73 watt peltier and it failed to do so at full power.
Has anyone ever done a mini fridge rig, or an old school locker with air conditioning? Maybe reading up on Peltier coolers would help a bit.
The amount of power required to cool a GPU with a TEC cooler would not be worth it in the long run unless you didn't pay for power.... But I think putting that money towards more GPU's would be more logical..