purposes whereby the overall efficiency of the system is improved as an alternative or in addition the return line can also be connected to a process water accumulator a swimming pool or the like for which in general heating is desired even in the summer or during a cooling operation of the heat pumps 2 fig6 shows the air side region comprising the mixing member 15 analogous to fig3 however with the heat pump being in heating mode in the top view the control is set to the extreme where only heated circulating air is fed in the bottom view the control is set to the extreme where only heated outside air is fed it is pointed out that heating operation is also possible in the first embodiment using local heat sinks to this end an adjustable air by pass must be provided so that in the heating operation the useful air is conducted over the heat exchanger 3 a of the recooling unit 3 fig7 to 9 show schematically the installation situation of the heat pump 2 according to any one of the above embodiments on a facade of the building in terms of the design the present heat pump corresponds to that of wo 2007 068 it comprises two cooperating rotary valves 2 a 2 b in the adsorption desorption region 8 and two cooperating rotary valves 2 c 2 d in the air conducting region 7 additionally shown are breakthroughs 16 19 in a facade 17 of the building wherein the lower breakthrough 19 conducts circulating air l 1 to the heat pump and the top breakthrough 16 conducts useful air into the building in addition an air filter.