@pl_rekin It's great when the 'penny drops' - Learning is not so bad when you can admit not knowing something and move on with enhanced knowledge! :)

@pl_rekin Only put the sensors in the fridge or freezer. Everything else is on top of fridge/freezer inc AC-DC 5V power, all in plastic boxes. I also put an LCD display in the fridge door to see all the data at a glance. If I were to do this again I would try HTU21D sensors instead, I keep meaning to change the DHT's to HTU's , but never seem to get around to it. :(