Energy Recovery Ventilation (ERV) transfers both sensible heat and latent energy (humidity) between exhaust and supply airstreams, recovering 50-75% of total energy. Unlike HRV systems that only recover temperature, ERV cores use materials that transfer moisture vapor in addition to heat. This dual recovery makes ERV systems superior in humid climates and applications with significant moisture loads.
Technical Specifications
ERV cores achieve combined sensible and latent efficiency ratings of 50-85%, with latent recovery typically 40-60%. A residential ERV unit transfers both heat and humidity while maintaining air separation through sealed core materials. Operating costs range from 300-700 watts depending on fan sizes and ductwork friction. Typical residential installations deliver 50-100 CFM with annual maintenance requirements for filter and core cleaning.
Climate Applications
ERV systems excel in humid climates including coastal regions, tropical areas, and spaces with high moisture generation (pools, laundries, greenhouses). They reduce dehumidification loads during cooling season by pre-conditioning incoming air with exhaust humidity and temperature. ERV installation requires professional ductwork design and commissioning to balance airflows and prevent moisture carryover. Annual energy savings of 20-40% are achievable in properly designed systems, with payback periods of 5-8 years in many climates.