Abstract: An environmentally friendly system (10) and corresponding method are provided for the conditioning of an indoor space (50), particularly of a greenhouse (60), in terms of the temperature, the humidity and sterility thereof. Air is forced into the indoor space (50) via a cloud of drops to form an air-water mixture, thereby conditioning the airstream as desired. The mixture then passes through a diffuser arrangement (30) to remove much of the water entrained by the airstream, and the resulting flow is provided to the indoor space (50). The degree of conditioning may be controlled by adjusting the delivery pressure and the form and density of water drops in the cloud, and the water drops optionally contain an evaporable biocide. Preferably, the system maintains a positive air pressure throughout the defined indoor space (50).

Abstract: The invention provides a phase change heat storage, light and temperature control building panel comprising a sealed housing having at least two walls transparent to visible light delimiting at least one intermediate space filled with a liquid-solid phase-change heat-storage material, wherein the material is substantially transparent to visible light in solid and in liquid phase, adsorbs heat while melting, releases heat while solidifying and undergoes phase change in a temperature range of about 5.degree.-28.degree. C. The invention also provides a method of day light and temperature control and night temperature control in dwelling units and plant enclosures utilizing the panels of the invention.