A HRV should reduce indoor humidity in hot humid summers?
The common rule of thumb is that HRVs (versus ERVs) do not change the moisture content of incoming air.
However in a 105F summer with RH 65%, the incoming air will be brought down to well below dew point in the heat exchanger. This should cause moisture to condense out, and deliver supply air with a lower humidity than the outdoor air. The excess moisture is taken away by the condensate drain.
That’s the theory anyway, but I couldn’t find any references to this in all my reading on HRVs. What’s the flaw in my theory?
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