ESEE – Environment Sensors for Energy Efficiency targets the markets, were with highly reliable information regarding environmental conditions measures can be deducted, which safe the use of energy. The research will be performed on several different sensor technoglogy approaches and finally validated in a test environment, e.g. under the environmental conditions of an aircraft. In addition an appropriate sensor network and innovative communication approaches will be investigated and create to enable air management systems to react on different sensor informations.Innovative approaches based on Silicon MEMS technologies, surface reactions and spectroscopic methods are in focus of the research. Intention is to provide solutions for energy efficient management and introducing this new solutions after the successful conclusion into the market of building control, air craft cabin monitoring and for electric cars indoor air control. The societal benefit will be the provision of healthy air in indoor environments in combination with a huge amount of safed energy due to the avoidance of preparing unnecessarily new fresh air. The applications of the interconnected sensors can be easily extended to other presence depend use of energy, e.g. heating and light.