for single CPU application, even the smallest of small ones are still enough but, the golden rule by which all overclockers should govern there actions and choices are valid here too....
"MORE IS ALWAYS BETTER"
through price is the exclusion on that rule... of coarse
it's actually the inverse, but not at the expense of performance or reliability though...
I know for a fact the box style de-humidifiers do work and can be retrofitted with minimal expenses and no need for cutting anything...... the newer ones I do not know yet, as I have not yet had the opportunity to do a conversion on them.... I suspect though that they might be a bit trickier to do properly...