Researcher Rachel van Ooteghem of the Netherlands Organization for Scientific Research has designed a control system for an improved solar greenhouse that yields more for less.

It uses an improved roof cover, heat regulation system, and humidity regulation system. A control system maintains the correct climate in the greenhouse, whatever the weather outside. Different climate factors in the greenhouse, such as temperature and relative humidity, can be used to make the correct adjustments to the settings of the greenhouse to maintain the optimum climate.