The Chinese Solar Greenhouse is simple but has a low productivity. To improve this, the inner greenhouse climate will have to become more controllable. To contribute to this, but keeping the passive character of the greenhouse, meaning that it doesn’t need additional heating, the Chinese Academy of Agricultural Science has developed the Active Heat Storage and Release System (AHSRS). By switching on and off a pump that runs water along large panels along the north wall the gathering of heat and the release of heat can be controlled. This project shows that the AHSRS does not affect the diurnal average temperature in winter, but can elevate the minimum temperature by some 2 °C. On dull days, however, the AHSRS doesn’t give an improvement since it doesn’t add anything to the shortage of energy. The fact that the Chinese Solar Greenhouse prevents frost, despite outside temperatures that may go down far below ‑10 °C is largely due to the high insulation applied. The insulation can be further increased by using screens inside the greenhouse. This project shows that such a screen may elevate the temperatures on the coldest days with about 1.5 °C and in Chinese Solar Greenhouse with the AHSRS even slightly more. When using a transparent screen like the Ludvig Svensson Luxous screen, the elevated temperature in winter comes together with a slightly increased amount of light entering the greenhouse. In warmer months of the year, the light entrance to the greenhouse will be reduced somewhat when using a thermal screen. Apart from temperature, also the humidity is often unfavourably high in the Chinese Solar Greenhouse. This report shows a simple system to reduce the high humidities in winter at the expense of about 7 kWh/m² of electricity per year. Another topic studied in this project was the use of soilless cultivation. The equipment, consisting of a irrigation and nutrient supply system, drippers and coco fiber slabs, worked well and contributed to a good an healthy crop. To achieve this, the greenhouse operator was ...