Our climate on the west coast is a lot warmer (and wetter) in the winter, so this may not work for you. I just have an in line fan that exhausts air from my canopy to the outside. I wired in a 3 speed switch in line, and low speed works great in winter. Even with the fan on the aquarium still provides most of the heat for my house, my furnace rarely comes on except during cold snaps (we keep our house at 18 C).
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