Nick,

It may work in the winter here, but we don't need it in the winter! It
would make the house too cold inside.

We don't have basements here, most places the water table is only about
3 feet down. Basements here are called indoor swimming pools. Storing
mosture in a basement slab could encourage mold growth. How good is
your mold insurance? The device would probably work in some parts of
the USA, but not here. Nick, You should go into HVAC contracting. It
would be interesting to see if you just went broke or got sued out of
existance. But you sure keep things interesting here! :-)

Stretch