This paper presents a comprehensive project for a liquefied petroleum gas (LPG) installation, as well as the overall HVAC system design, including heating, cooling, ventilation, and hot water preparation, for a catering facility intended for tourism purposes in the city of Split. The paper begins with an overview of liquefied petroleum gas, detailing its physical and chemical properties, storage, transportation, and other relevant aspects. Following this, the heat losses and gains of the building are calculated in accordance with EN 12831. A brief description of the building is also provided, outlining its purpose, structural components, and characteristics. The paper then presents the monthly heat loss and gain calculations specific to the building's location, along with the hot water demand calculations for the restaurant. Subsequently, the paper details the design and calculations for the LPG installation, both inside and outside the building. This is followed by ventilation calculations for various areas: the kitchen, where gas appliances are located; the boiler room, where the gas boiler is housed and the sanitary areas within the restaurant. The paper concludes with the system design and equipment selection for cooling the restaurant area, and the final chapter provides a cost estimate for all HVAC-related work for the project.