If ERVs capture and return the moisture to the building, why do they make a lot of sense in hot-humid climates?
The statement "Some contractors use ERVs in place of bathroom and kitchen fans that are meant to exhaust moisture, but most ERV's capture and return the moisture--and other unwanted vapors like formaldehyde--back to the living space." Is what has me a bit confused. If an ERV is returning moisture and toxins, in what sense is it a ventilator.
I am also curious about the energy used and cost of these systems. At what point does it just make more sense to provide well controlled fresh air ports or build less air tight buildings? While these systems make sense in a diagram from a physical perspective, do they make sense at any cost, both in terms of ROI and energy consumption? And how do we create that equation?