Here at GBA, we have consistently advised readers who plan to install a heat-recovery ventilator (HRV) or an energy-recovery ventilator (ERV) to install dedicated ventilation ductwork rather than trying to distribute ventilation air through their heating and cooling ducts. That advice won’t seem particularly burdensome if your house doesn’t have any heating and cooling ducts — as is typical in a home with ductless minisplits or a hydronic heating system and no central air conditioning.
But if your house already has heating and cooling ducts, you may instinctively rebel at GBA’s advice, muttering, “Why can’t I use the ducts that I’ve already got?”
Here are the reasons:
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