Just to clear things up a bit here...
This patent is not directed solely to desktop humidors. In this regard, the claims (metes and bounds) of the patent are not limited by size; but, by required elements, e.g., direct current source, digital display. In other words, this could be interpreted as covering a larger unit.
On the other hand, this patent would be very easy to design around. For example, in order to avoid infringing this, one would simply provide a cooled humidor without a digital display, or without a digital display connected in the manner recited in the claims. There are several other ways to avoid infringing this patent.
I think that the bottom line here is that thermo-electrically cooled humidors are known and used. Hopefully, as technology advances, we can look forward to less expensive commercially produced units in all sizes.