High-energy consumption in buildings is an important problem for sustainable future and many researchers tried to solve this problem via different heating/cooling systems. A solar combisystem
(SCS) is one of these systems, which provides both solar spaces heating/cooling as well as hot water from a common array of solar thermal collectors, usually backed up by an auxiliary non-solar heat source 
. When a geothermal heat pump is used, the combisystem is called geosolar. The experimental studies showed that SCSs are capable of providing energy demand from 10% to 100% depending on the climatic conditions, system components, system efficiencies, and energy demand 
. Europe has most well-developed ...