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Hi David,
Yes, you do need to insulate between the cool and hot sides, a piece of thin polystyrene foam sandwiched between them should be sufficient with a cutout for the module to fit though. Envisage the thermoelectric device (peltier module) in an Esky, there is about 20mm of insulation between the cooling bit inside the unit and the heatsink on the outside. The unit I fitted into to an Esky had an extension aluminium section to allow for the thickness of the Esky wall it was inserted through. Ican scan a picture and send you via email if you like tomorrow evening.
The fan should blow onto the heatsink too not the other way round.
Regars IanG
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