Energy Recovery HVAC Solutions : Xetex Inc Energy Recovery, HVAC, Minneapolis, MN, air-to-air heat exchangers, Heating, Ventilation, air-to-air heat exchangers, Air Recovery, Air Conditioning XeteX is intent on providing the most cost-effective air-to-air heat exchangers available today. Based on technical design and application experience on commercial HVAC equipment since 1960, XeteX was incorporated in 1984 to develop heat exchangers and systems appropriate for the expanding needs of commercial buildings for better indoor air quality.