Performance Verification
Heating and Cooling Solutions


Exergy is undertaking a performance validation study in several buildings across Europe, to assess the operational performance of state-of-the art solutions for HVAC (Heating, Ventilation and Air-Conditioning) deployed as part of the H2020 THERMOSS Project.

According to the International Energy Agency (IEA, 2018), buildings are responsible for 36% of global final energy consumption and nearly 40% of total direct and indirect CO2 emissions, their energy demand continues to rise at nearly 3% each year. For this reason, international and national policies are focusing on reducing C02 emissions and thus energy demand from fossil-fuel sources in buildings. In order to achieve these targets, more efficient building services are key as approximately 50% of the energy consumption in buildings corresponds to heating and cooling.

Exergy is supporting the deployment of innovative technologies for HVAC systems with low energy demand and CO2 emissions, combining them with solar water heating or photovoltaics for even higher savings. We bring this forward with real-time monitoring and control solutions. The complexity of these solutions (old and new systems, heat pumps, renewables, sensors, controls etc) requires a detailed engineering assessment. Therefore, a performance verification is recommended to check that the system works as planned, meeting CO2 and energy savings requirements.

How can we ensure the best fit for European buildings?

We analyse building needs and constraints and select the most efficient system according to building type and geographic location. Our Europe-wide catalogue involves cutting-edge technologies and solutions to provide local upgrades (e.g. monitoring, electricity production) or complete conversion (e.g. HVAC plant). We allow savings of 20% to 30% in primary energy.

How have we ensured the best fit in previous buildings?

Real-time monitoring of the heating and cooling equipments guided the retrofit. Sensors have been installed and the flow of data is keeping building managers informed. Old heating systems have been upgraded or paired with:

  • Decentralised hybrid and electric vapour compression heat pumps and 90 m2 solar water heating system in a housing development (Spain) – 30% primary energy savings on gas,
  • Gas absorption heat pumps in a nursing home (England) – 30% more convenient than traditional gas boilers,
  • Heat interface units in a tower block (England) – increase local control and limit losses,
  • MicroCHP (solid oxide fuel cells) in large detached houses (Latvia) – produce on-site electricity instead of buying it from the grid.



Exergy is providing energy and economic efficiency related services to the project consortium. Through the deployment of an ad hoc monitoring and on-site data collection, Exergy developed technology implementation plans and performance validation strategies, whilst performing energy simulations and operational performance assessments of different installations in Latvia, France, Spain and the UK.


The development and assessment of innovative heating and cooling technologies presents technical challenges for local installers with no prior knowledge and experience. Exergy has been closely working with the project team, technology manufacturers, local installers and the site owners providing guidelines and advice in order to successfully install and operate the THERMOSS technology packages.


Installation and Performance Verification of the Following Technologies:

Spanish Demo Site: 90 m2 of solar thermal panels have been deployed. They will work in combination with the existing systems and the new heat pumps, to warm up the district heating ring.


Exergy is demonstrating and achieving the following KPs:

The THERMOSS Project has received funding from the European Union’s Horizon 2020 Research and Innovation Programme

Interested in this project or want to find out more?

Get in touch with our specialist in this area
Andy Thompson

Senior Energy Efficiency Engineer