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A balanced ventilation system with an HRV or an ERV is the preferred ventilation system for a Passivhaus building.

Although balanced ventilation systems are expensive to install, they have the lowest operating cost of any ventilation option — assuming, of course, that the designer or installer hasn’t made any blunders.

High humidity in tight houses In Houston, a tight, well insulated house is more likely to have problems with high indoor humidity than an older leaky house.

In a tight home, an air conditioner doesn’t run anywhere near as often as in a leaky home, especially during the swing seasons (spring and fall).

In cold climates, water vapor captured from the outgoing airstream by ERVs can humidify incoming air.