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Choosing Equipment for a Whole-House Ventilation System

Tight, super-insulated houses need some kind of mechanical ventilation to keep indoor air healthy. Installing exhaust fans in the kitchen and bathrooms is the simplest option. More often, energy-efficient builders install either a heat-recovery ventilator (HRV) or an energy-recovery ventilator (ERV). Both systems incorporate a heat exchanger that moderates the temperature of incoming air, which helps ease the energy penalty in both summer and winter. But ERVs also are designed to transfer some of the humidity in the air stream.

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Energy, Heating and Cooling

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