A room air conditioning system, having - a base element, - a housing with a fan for aspirating the air of a room through the housing, wherein the housing is formed in a separated manner from at least one closed housing element (2a, 2c) and at least one housing element through which air can flow, wherein the housing elements (2a, 2b, 2c) are arranged supported on the base element, and - a refrigerant circuit with the following components in the flow direction of the refrigerant: a compressor, a heat exchanger operated as a deheater for cooling gaseous refrigerant, a heat exchanger operated as a condenser, an expansion element and a heat exchanger operated as an evaporator, wherein - the refrigerant circuit has a pressure compensation line which extends between a branch site formed at the high-pressure side and a mouth site formed at the low-pressure site and which is formed with an expansion tank, at least one capillary tube (30, 32) and at least one safety valve (29, 34), - the heat exchanger operated as a condenser is formed as a refrigerant/coolant heat exchanger with ports for connection with a coolant circuit, wherein the compressor, the heat exchanger operated as a condenser, the expansion element and the components forming the pressure compensation line are arranged within the volume enclosed by the at least one closed housing element (2a, 2c), - the heat exchanger operated as an evaporator is formed as a coolant/air heat exchanger for conditioning the air of the room and arranged within the volume enclosed by the housing element through which air can flow, and - the components of the refrigerant circuit are arranged on the base element and enclosed by the housing such that the complete room air conditioning system can be arranged as a continuous unit completely within the room whose air is conditioned with the room air conditioning system. - a base element, - a housing with a fan for aspirating the air of a room through the housing, wherein the housing is formed in a separated manner from at least one closed housing element (2a, 2c) and at least one housing element through which air can flow, wherein the housing elements (2a, 2b, 2c) are arranged supported on the base element, and - a refrigerant circuit with the following components in the flow direction of the refrigerant: a compressor, a heat exchanger operated as a deheater for cooling gaseous refrigerant, a heat exchanger operated as a condenser, an expansion element and a heat exchanger operated as an evaporator, wherein - the refrigerant circuit has a pressure compensation line which extends between a branch site formed at the high-pressure side and a mouth site formed at the low-pressure site and which is formed with an expansion tank, at least one capillary tube (30, 32) and at least one safety valve (29, 34), - the heat exchanger operated as a condenser is formed as a refrigerant/coolant heat exchanger with ports for connection with a coolant circuit, wherein the compressor, the heat exchanger operated as a condenser, the expansion element and the components forming the pressure compensation line are arranged within the volume enclosed by the at least one closed housing element (2a, 2c), - the heat exchanger operated as an evaporator is formed as a coolant/air heat exchanger for conditioning the air of the room and arranged within the volume enclosed by the housing element through which air can flow, and - the components of the refrigerant circuit are arranged on the base element and enclosed by the housing such that the complete room air conditioning system can be arranged as a continuous unit completely within the room whose air is conditioned with the room air conditioning system.