Hållbar is a modular cooling system for food storage in private households. The focus is on keeping the volume to be cooled low for daily use in order to make a positive contribution to energy saving. The possibility of expansion means that more space can be created temporarily or in the long term if required. Separate modular parts containing the technical components can be integrated into the system of cooled and non-cooled enclosure units. Replaceable elements guarantee a long service life and separation of materials by type.