Re: peltier mini frigobar
Better use hot air station heater to make warm air and force that hot air over some pipe inside, precise thermostat will regulate when heater should be on or off. You can se histeresis to minimal or give some higher tolerance on temperature inside, all depence from thermostat which you use. Peltier need more handwork on that fridge and its not elegant, plus you will get water-dew outside. Better save that peltier if you need to cooldown similar portable fridge.
or
If you whant to eliminate air turbulance inside, use heat pipe. Outside use heaters from standard soldering station, heat pipe will transfer heat inside, without any outside contact with inside air.