Underfloor heating always works in the best operating points in relation to the outside temperature, saving energy. A special micro-floor sensor has been developed by GDS and is installed during the construction of the underfloor in a way that is accessible and repairable. Controller, designed by GDS, given the room temperature and the measured relative humidity, constantly calculates the air liquefaction point and ensures the minimum floor temperature (hence the maximum cooling efficiency) with a guarantee that no liquefaction will occur. The system works in both conventional and KNX installations