LG Heat Recovery Ventilation Systems. High efficiency heat recovery, Cross Flow heat exchanger, Sensible and latent heat transfer, Stand alone or integrate to Air Conditioning Systems, Hard Wired controller (sold seperatley). With today’s concern for maintaining a healthy indoor environment, the LG Eco V is an integral component of any HVAC system. This high-efficiency heat exchanger has a strong filter that removes contaminants quickly and effectively, providing better indoor air no matter what’s happening outside.