Here in Minnesota, a common heating option for garages in homes with hydronic heat in the basement is to also add in-slab heat to the garage. It works great as far as keeping the space warm and making the snow melt off the cars, but I worry about where all that moisture is going. It is not uncommon to see the windows in such a garage iced over and water literally dripping from the steel garage door (even if insulated).
The warm floor really makes this more of a problem since it directly drives the evaporation of the large puddles on the floor.
What would be the best strategy for drying this space in the winter? I am thinking an HRV dedicated to just the garage with a humidistat, but am concerned since the manufactureres don't really talk about this application.
Will running an HRV in a normal setup pull out the tens of gallons of water per day dumped into a garage in Minnesota winter? Any thoughts on how to size the unit?
One thought I had was to run the HRV not in a ventilation setup, but swap the connections to short-circuit it to be just an outdoor-air-cooled dehumidifying machine. But I worry this will just turn the unit into a block of ice, even with its defrost cycle.