From what i gather it comes with a built in humidity/ambient temperature sensor so automatically adjusts to prevent condensation, it's also using a variable voltage so you don't get the on/off situation of massive power draw all the time or heat soaking back towards the cold side.
It's a pretty 'smart' bit of kit TBH, the der8auer video in the article takes a more technically focused look at it, well worth the watch IMO.