Question: I am interested in using an ERV to address basement moisture, though I am not as concerned about the rest of the house. Therefore, I plan on drawing air from the basement, exhausting it outside through the ERV, bringing in fresh air through the ERV, and dumping it in one location upstairs. I will also leave the door at the top of the basement open so replacement air can come into the basement from upstairs. In essence, I would have a circle: Air out of basement, supply to first floor and then back into basement. Should this help reduce moisture and odors in the basement? Any thoughts? Thanks.
Answer: It is always a good idea to ventilate basements. Since they are below ground, natural air exchange rates are low and there are many potential pollutants in the basement that need to be exhausted or diluted with fresh air. Odors will be controlled and an ERV should work efficiently in your home. The only caution is that when outdoor humidity is high, the ventilation will potentially be bringing in air that is more humid than the basement air. Air conditioning or spot dehumidification may be necessary during those times. Generally, ventilation will control excess moisture but there are cases where an additional dehumidification strategy will be required.
More information on ERVs and HRVs is available on the Home Ventilating Institute’s Web site and in the Fresh Ideas Home Ventilation & Indoor Air Quality Guide.
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