🇫🇷 Thaon-les-Vosges, France
Saving Costs by Boosting Energy Efficiency at a School Building in France
Our client
Building type: School Building
Client Name: Inyus for Gohypré Primary School
Location: Thaon-les-Vosges, France
Building parameters: 3 floors, 39 rooms, size of 3190m2
Product(s) implemented:
130 Vicki LoRaWAN® Smart Radiator Thermostats
Third-party devices:
53 temperature, humidity, presence, and CO² sensors
Partner: Inyus
“We achieved amazing cost savings fast during the initial winter season following the installation of the smart energy system, and maintained a downward trend in expenses during the subsequent season as well.”
Project owner
About Inyus
Inyus specializes in providing connected heating solutions tailored specifically for tertiary buildings in France, including those in the educational and hospitality sectors. The company focuses on enhancing the energy efficiency of these buildings by offering individual heating control of the rooms based on the occupancy and the specific user needs, resulting in a significant reduction in costs. Their tailored solutions not only preserve energy and create savings but also protect the environment by reducing the CO2 impact while at the same time maintaining a pleasant and comfortable indoor environment for the users. Inyus solutions are eligible for the BAT TH 104 Sheet, BAT TH 116 Sheet, and the BACS decree.
By integrating Inyus' advanced smart solution with MClimate LoRaWAN IoT devices, hotels, and educational institutions can improve their energy efficiency and reduce costs, leveraging a customized approach.
Challenges
Gohypré Primary School encountered a great challenge with heating inefficiency, leading to substantial energy expenses. The original heating system relied on a gas boiler to heat the radiators in the whole building 24/7, even during the night when not occupied. Radiator temperature adjustments were made only manually by the teachers in the classrooms when they decided it was too hot or cold, leaving the other areas of the building, such as canteens, infirmary, nap rooms, and corridors, to be heated constantly without any intervention. The Gohypré primary school was searching for a solution to decrease its energy expenses and improve the sustainability of its building.
Solution
To address the issue, the school decided to digitalize their heating system relying on Inyus as a partner who analyzed the existing installation and found out that the school's energy consumption is with an average of 190 kWh per unified heating degree day or 171 kWh/m². A smart heating solution with 119 MClimate Smart Radiator Thermostats together with 53 temperature, humidity, presence, and CO² sensors connected to the Inyus BMS was completed in June 2022 in the common areas and additional 11 TRVs in 2025 in the class rooms, allowing the regulation of the room temperature individually based on the occupancy, preventing the heating of unoccupied rooms. They’ve also set a schedule for maintaining 20°C when occupied and 16°C when the rooms are empty. Thanks to Vicki's wide compatibility with existing radiators, the installation process was fast, and there was no need for any professional assistance.
For the first heating season after the smart installation from December 2022 to February 2023, the average ratio was 137 kWh/DJU, a significant drop of 24,31% of weather-corrected consumption.
In 2023, consumption is picking up again because the town hall decided to open the school during the holidays for the social centre, and the building was occupied much longer in the year.
In December 2025, energy consumption was 17% lower compared to December 2024, however, the complete data for the 2025/2026 heating season is not yet available.
Ultimately, the energy efficiency of public buildings such as Gohypré Primary School is strongly influenced by occupancy, meaning that energy use and therefore costs can be reduced by adapting the heating to when the buildings are actually used.
| Weather-corrected indicator: kWh / DJU (in kWh/DJU) | Difference from last year heating season | |
| 2020/2021 | 146 | |
| 2021/2022 | 181 | +23.97% |
| 2022/2023 | 137 | −24.31% |
| 2023/2024 | 180 | +31.39% |
| 2024/2025 | 188 | +4.44% |
Results
24.31% energy reduction
in the first heating season
99% compatibility
with old radiators
Up to 10 years
of battery life
Installation
within 24 hours
Products in this case study
Vicki LoRaWAN® Smart Radiator Thermostat
Recommended products
MClimate Wireless Thermostat LoRaWAN®
MClimate HT + PIR lite LoRaWAN®
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