During 2017 and 2018, we participated in the exchange of air-handling units for ventilation of the therapeutic pools in the Klimkovice Sanatorium. The scope of our delivery included AeroMASTER XP swimming-pool units, including VCS control units. Among others, the exchange of the air-handling units resulted in a reduction in operating costs. This delivery was performed with minimal restrictions on the sanatorium operation. This fact placed great demands on the pace of commissioning of the delivered equipment and its reliability. The installation was complicated due to the small installation openings to the existing air-handling plant. This restriction forced us to assemble the plate heat exchanger of one of our units directly inside the air-handling plant.