If you have ever felt a bit tired slumming it on your couch or at the office, you are certainly not the only one. But there could be a simple explanation and solution to it. CEO of New Nordic Engineering, Stig Dahl-Hansen, explains: “We test our sensors at an office workplace, where the employees are tired and unhappy with the indoor climate. After a few days of monitoring the indoor climate of the office, it is easy to see where the problem is: too much CO2 in the air. New habits for opening the windows and a few other adjustments and the problem is solved,” explains Dahl-Hansen, who himself has many sensors in his own house.