In order to oppose various causes of the climate crisis, many measurements are developed and evaluated worldwide. One important step towards carbon neutrality and therefore to stop global warming, lies in reducing energy consumption of every type. One of the biggest opportunities to save energy in different forms, lies in the building sector. Especially office rooms often demand more energy than necessary due to inefficient handling of different resources. Hence, this work proposes a simple, low cost and smart system to automatically control a thermostat, workstation and lamps in an office environment in order to save as much energy as possible. Applying the proposed system leads to electric energy savings figuring at least 8.6 kg a year per office only on controlling power supply of one workstation. Furthermore, promising results about possible savings in electricity are examined by automatically controlling lights. Heating energy utilization can be additionally reduced with the use of smart thermostats, especially on weekends and outside working hours, by turning off thermostats. It is shown, that using only low cost equipment in form of sensors and actuators can reduce office energy demands and therefore gives perspectives to reduce global warming.