Whenever we think of building codes as they relate to HVAC, we typically think of the dilution of volatile organic compounds (VOCs), as well as controlling mold growth through high-end fresh air ventilation with energy recovery ventilators (ERVs). But there’s a lot more to consider. Since we’re focusing this article on humidification and dehumidification, let’s start there.
While balanced ventilation does have energy benefits, there is a misconception about its ability to reduce humidity. In a hot, humid climate, an ERV is not removing enough moisture as it enters the home. If it was, it would a have a drain spud. ERVs handle a minimal amount of moisture (only what can be transferred in the cross stream). Air conditioners provide more, although they stop when temperature goals are met, which occurs before the latent load is controlled. Dehumidifiers are the only product specifically designed to mitigate moisture and reduce indoor RH.