The efficiency of such a system is strongly dependent on the temperature lift. Systems in applications with a low external temperature lift have an as-of-yet unexhausted potential for saving the primary energy use of buildings as well as reducing their CO2 emissions. However, the potential of high efficient heating and cooling systems with low temperature lifts cannot be utilized sufficiently, as at the moment standard plants are typically designed for relatively large temperature lifts. In the present CTI project, the Lucerne University of Applied Sciences and Arts, Horw and BS2 AG, Schlieren will develop a heat pump or air conditioning system. It will have a turbo compressor with a thermal power range of 4kW to 20kW and be optimized for low-lift applications. That means, the system will achieve an unprecedented high and relatively constant quality grade in the relevant temperature lift range of 10K to 30 K. The first experimental studies showed clearly that with this system, the potential of a low temperature lift can be optimally exploited and therefore, significant efficiency improvements can be achieved.