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Swimming is a good form of physical activity that keeps swimmers fit and healthy. In countries with cold climates, swimming is allowed only indoors. Since adequate water and air parameters must be ensured in these buildings, they are very energy-consuming. In new buildings, modern solutions can be used, thanks to which technologically advanced energy-saving systems can be used. Unfortunately, in existing buildings, it is not always possible to make technical changes, or they are associated with high financial expenses. In this article, a method of in situ measurement of selected air parameters is proposed, on the basis of which it is possible to suggest scenarios for changes in the control of air technology and parameters in order to achieve energy savings. The easy measurement method was applied in a typical swimming pool building, and energy-saving measurements were taken on the first day to obtain a baseline. Seven scenarios were analyzed that would lead to a reduction in energy consumption without the introduction of new elements into the facility. The main task was to find a solution that ensured adequate thermal comfort in the building. Significant energy savings were achieved in each scenario: 6–47% compared to measured energy consumption. To improve the energy efficiency of swimming pools, especially in the current energy crisis related to the economic and political situation, all methods for reducing the energy demand are desirable. The proposed assessment method will allow for energy-consuming elements and allow for changes in the use of equipment in the swimming pool building. However, the main objective is to maintain the thermal comfort of swimming pool users, as no savings can be achieved at the expense of worsening the feeling of building users. [ABSTRACT FROM AUTHOR]

• A new approach to designing a ventilation system for an indoor pool was proposed. • A heat pump with double condenser was found to be the best solution. • Decentralization results in a decrease in the energy consumption of fans by 36%. • Decentralization causes a decrease in heat required for heating the air by 17%. Image, graphical abstract [ABSTRACT FROM AUTHOR]