Energy Recovery Ventilators work to ventilate your home while minimizing the energy lost to heat and cool your home. In the winters the ERV transfers heat from warm indoor air being exhausted to cold supply air. In the summer, the supply air is warm and is cooled by inside air. These processes reduce warming and cooling ventilation costs.
The equipment from an ERV is generally a heat exchanger, fans to push air through, and controls. An ERV also pushes through a certain amount of water vapor to keep humidity levels steady. ERV systems are designed to recover up to 80% of the energy in existing air and deliver that energy to the incoming air. The systems are found to be most effective in climates that have extreme conditions, very cold winters and hot summers. An ERV is a relatively simple install because they are able to work on existing duct work.