A hot isostatic pressing arrangement for treatment of articles by hot isostatic pressing, comprising a pressure vessel including: a furnace chamber comprising a heat insulated casing and a furnace for heating of a pressure medium during pressing, the furnace chamber being arranged to receive and hold the articles, and a unit for exchanging thermal energy with a pressure medium arranged below said furnace chamber and arranged inside said pressure vessel, wherein said unit for exchanging thermal energy is arranged such that the unit can be heated and cooled by the pressure medium itself and such that the unit can absorb thermal heat from the pressure medium during cooling of articles and transfer thermal heat from the unit to the pressure medium during heating of articles; wherein a first guiding passage is formed between an outer wall of the pressure vessel and the casing; and wherein the casing comprises a heat insulating portion and a housing arranged around said heat insulating portion, whereby a second guiding passage is formed between said heat insulated portion and the housing; characterized in that the pressure vessel further includes: a movable guiding arrangement (34, 35) arranged to selectively guide a flow of pressure medium past the unit, for avoiding thermal energy exchange between the pressure medium and the unit, or through the unit, for allowing thermal energy exchange between the pressure medium and the unit. a pressure vessel including: a furnace chamber comprising a heat insulated casing and a furnace for heating of a pressure medium during pressing, the furnace chamber being arranged to receive and hold the articles, and a unit for exchanging thermal energy with a pressure medium arranged below said furnace chamber and arranged inside said pressure vessel, wherein said unit for exchanging thermal energy is arranged such that the unit can be heated and cooled by the pressure medium itself and such that the unit can absorb thermal heat from the pressure medium during cooling of articles and transfer thermal heat from the unit to the pressure medium during heating of articles; wherein a first guiding passage is formed between an outer wall of the pressure vessel and the casing; and wherein the casing comprises a heat insulating portion and a housing arranged around said heat insulating portion, whereby a second guiding passage is formed between said heat insulated portion and the housing; characterized in that the pressure vessel further includes: a movable guiding arrangement (34, 35) arranged to selectively guide a flow of pressure medium past the unit, for avoiding thermal energy exchange between the pressure medium and the unit, or through the unit, for allowing thermal energy exchange between the pressure medium and the unit. a furnace chamber comprising a heat insulated casing and a furnace for heating of a pressure medium during pressing, the furnace chamber being arranged to receive and hold the articles, and a unit for exchanging thermal energy with a pressure medium arranged below said furnace chamber and arranged inside said pressure vessel, wherein said unit for exchanging thermal energy is arranged such that the unit can be heated and cooled by the pressure medium itself and such that the unit can absorb thermal heat from the pressure medium during cooling of articles and transfer thermal heat from the unit to the pressure medium during heating of articles; wherein a first guiding passage is formed between an outer wall of the pressure vessel and the casing; and wherein the casing comprises a heat insulating portion and a housing arranged around said heat insulating portion, whereby a second guiding passage is formed between said heat insulated portion and the housing; characterized in that the pressure vessel further includes: a movable guiding arrangement (34, 35) arranged to selectively guide a flow of pressure medium past the unit, for avoiding thermal energy exchange between the pressure medium and the unit, or through the unit, for allowing thermal energy exchange between the pressure medium and the unit. a movable guiding arrangement (34, 35) arranged to selectively guide a flow of pressure medium past the unit, for avoiding thermal energy exchange between the pressure medium and the unit, or through the unit, for allowing thermal energy exchange between the pressure medium and the unit.