The present invention relates to a method for cooling an indoor environment in a house with the aid of a cooling plant, and to a cooling plant for cooling an indoor environment. The cooling plant comprises a cold store in the form of a rock store (19,20), a cooling system for cooling the indoor environment and a cooling medium for transport of cold. The cooling plant has only one cooling mode and only one charging mode. In cooling mode, the cooling medium is cooled with cold from the rock store (19,20) and the cooling system is fed only with cooling medium cooled only with cold from the rock store (19,20). In charging mode, the cooling medium is cooled only with outside air and/or ground cold and the rock store (19,20) is cooled only with the cooling medium cooled only by outside air and/or ground cold.