Hope this isn't a stupid question but was wondering about the heat gain from having an onboard fridge.

Like the idea of a proper fridge in the camper but its mounting spot is likely to be in the unit behind the front seats. Id like to put a deck on top of this as cockpit for the dog but was wondering about the heat output from the fridge vent and how to get rid of it? Or have I missed something.

Cheers for any advice.