In my fish room, I'm lucky enough to have a window that I can keep open. But in this cold, I had to shut it. Even with my dehumidifier running all of the windows on the main floor have steamed up and I also have ice on the window in the fish room.
I think that an HRV is the best for sure. If you already have one I'd think you'll be just fine.
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They call it addiction for a reason...
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