To further improve the energy efficiency of heating and air conditioning systems in existing buildings, periodic inspection, regulation and operation of these systems was legislated. Two guides issued for each system describe the work and checks to be carried out by technical system installers. The aim is to ensure that appropriate maintenance measures are taken to ensure that heating and air-conditioning systems operate with the best possible energy efficiency.

In addition, energy efficiency requirements have been set for new systems installed in existing buildings and for existing systems being upgraded. In addition to air conditioning and heating systems, the requirements cover hot water production systems, large ventilation, lighting, automation and control systems and on-site electricity generation systems. Implementation of the requirements is mandatory to the extent that it is technically, operationally and economically feasible.

The Energy Agency has established the register of installers to ensure some minimum quality standards in terms of the installation of systems and their energy efficiency. Quality assurance is expected to gradually increase the confidence of building owners in the technical staff working in the field of technical and small-scale renewable energy systems.

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