Rehact has developed a unique system to provide a building with low tempered heating, cooling and ventilation. The system is able to reduce the building’s need for external energy with up to 85% by combining renewable energy sources like solar collectors and ground source heat pumps (GHP) with an inventive distribution system build around the patented Rehact ventilation unit, RVU. By increasing the efficiency of the energy distribution system within the building three distinct advantages can be achieved; an increased level of comfort, a significant savings in operating cost and an attractive installation cost giving a fast payback. The system is designed mainly for larger buildings in both cold and warm climates around the globe. Rehact is based in Sweden, but the sales effort have been focused on foreign markets.