Today’s homes are built tighter than ever before. While this may be good for energy efficiency, tighter homes trap indoor air pollutants. Indoor air quality is becoming increasingly important. That is why Robertshaw is introducing a new line of recovery ventilators. These new ventilators are designed to bring in fresh, outside air and exchange it with the stale in.side air without compromising the energy savings of your home. Four models are available. The Heat Recovery Ventilators (HRV's) are designed for cooler climates where the demand for heat exchange is greatest. The Energy Recovery Ventilators (ERV's) are designed for the warmer climates where cooling and humidification control is more important. Both the HRV's and ERV's are available in two sizes to fit the square footage of any home.