[G6Tanuki]

It's always good to dehumidify. My Ebac "Powerdri Professional" runs continuously during the cooler months, and generally keeps the relative-humidity below 60%.

If you're worried about the power consumption - remember that the while the conversion of ambient moisture into condensed water requires energy, in the process you also recover the 'latent heat of evaporation' - meaning you've got a sort-of heatpump thing going on.