emissions by 2020 compared with 1990 levels and an 80% reduction by 2050. They emphasize the notable potential and importance of heat recovery technologies to achieve this goal. See also HVAC Heat exchanger Solar air heat Renewable heat Water heat recycling Seasonal thermal energy storage Passive cooling Solar air conditioning Air conditioning - Health implications Passive house - "Passivhaus" Low-energy house Low energy building List of low-energy building techniques Green building Zero energy building Sustainability Sustainable architecture Sustainable design References External links AIVC Information Paper VIP6 "Air-to-Air Heat Recovery in Ventilation Systems" Heat recovery in Industry Energy and Heat Recovery Ventilators (ERV/HRV) Write-up of Single Room MHRV (SRMHRV) in UK home Heat Recovery Ventilation system Cost Builder Insight Bulletin - Heat Recovery Ventilation Heating Ventilation Residential heating Sustainable building Low-energy building Energy conservation Energy recovery