I think this is similar to the difference between a heat pump and a heater. Normally to dehumidify we strip the humidity out of the air and turn it into water,

I think this is similar to the difference between a heat pump and a heater. Normally to dehumidify we strip the humidity out of the air and turn it into water, but all the embedded energy in the water vapor needs to go somewhere and it ends up heating up the house. Here instead they have a device that on net pumps humid air out of a structure. It doesn’t try to pull it all out of the air, just to move it from one bit of air to another so it doesn’t have to pay the full price of removing it