Run your intake air through a few meters of buried tube(s). That way it will be precooled in the summer (and slightly dehumidified) and prewarmed in the winter. Not only does this increase the system's efficiency, but also if sized correctly, the intake air will never be below freezing, so no defrost will be required.
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Ecorenovation - the bottomless piggy bank that tries to tame the energy hog.
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