I use my HRV year round. Power costs are much lower than a dehumidifier also.
That being said though, dehumidifying would probably delay having to use A/C for the house at a bit of a cost savings.
I use mine in summer to continually be bringing in fresh air as I shut the house up for the A/C, not to decrease humidity.
However, the drip line from the HRV definitely is showing that water is being removed from either the incoming or outgoing air, I don't know for sure which.
I suspect its coming from the incoming air as the outgoing air has had reduced humidity from the actions of the A/C.
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