The REACt project (INCO-CT-2003-015434-REACt) aims at the introduction in target Mediterranean Partner Countries (MPC) of an advanced and innovative hybrid solar hot water and air-conditioning system. Taking into account the climatic, geographical and economic situation of each country, we propose to operate on two systems based on linear parabolic trough collectors. Both systems will be calibrated for two different applications and will act as “test bed” for innovative technologies such as direct steam generation, never before utilized on systems of this size and purpose; new diathermic fluids, optimized for high thermal capacity and high performance doubleeffect ammonia chillers. Specifically, we propose to operate in view of the placement of the systems in two test areas: a public hospital in Morocco and a tourist resort in Jordan. A further site that will be examined is a public hospital in the city of Baabda, Lebanon, where many of the activities (country analysis, assessments, dissemination) will be performed even if no system will be installed in such site in the framework of this project.