Gimnazija Isidora Sekulić is located in the central urban zone of Novi Sad. Built back in 1936, the school has undergone several renovations over the years, with the latest reconstruction and upgrade completed in 2022.

During the reconstruction, ION Solutions implemented a Building Management System (BMS) that controls heating and cooling through fan coil units in 48 rooms. Each room is individually controlled via computers and predefined operating schedules, contributing to significant energy savings and cost reduction.