Buildings’ Energy Classes


What are the Energy Performance Classes of a Building?

You are probably already familiar with the concept of “Energy class”. You can see them on any refrigerator, washing machine or other appliances. Like these, a building may fall into an energy class or another, depending on its “performance”.

In other words, the energy class is a “grade” granted to the building according to its capacity to save energy. The 7 “Grades” are from A to G, but each class has a score from 1 to 100 behind depending on many parameters.

How are the classes established?

For establishing an energy class various criteria are taken into account: wall thickness, type of masonry, roof type, subsoil condition, condition of the heating system columns, performance of the heating or ventilation system. All this information is obtained through on-site investigation by the approved auditor, from the specific documents or, in their absence, from the information from the owner or through specific measures.

Class energy A requires a consumption of less than 125 kWh / m2 / year, energy consumed to ensure optimal conditions – temperature, lighting, hot water. In contrast, energy class G involves a consumption of over 820 kWh / m2 / year.

Most buildings in Romania fit at this moment in grades C or D. Not even most of the new buildings fall within class A, unless they have been specifically designed and constructed for that purpose. Ideally, at this point, is to bring a building in class B or C and urgent measures should be taken for buildings in classes E, F or G.

However, by means of specific measures, the energy performance of a building can be improved substantially. This fact reduces costs, especially in seasons with extreme temperatures and achieves a high comfort. Because, isn’t it true, we really don’t want to wear gloves and a scarf in front of the TV in the middle of winter or with an ice bag in our arms in the middle of summer!

Energocertif stabilire claselor energetice