They already exist! Well, small ones. A hotel I was staying at had a small bar fridge that used a Peltier. I only know because it stopped working so I checke

They already exist! Well, small ones. A hotel I was staying at had a small bar fridge that used a Peltier. I only know because it stopped working so I checked it and realized it was only a Peltier plus a heat exchanged (a cyclopropane loop). I presume a full size fridge is outside of reach at this point.