On the market there are many recommendations of varied nature. Often obtaining the right recommendation is required by law, but there are also many voluntary recommendations. Manufacturers of construction products may obtain such recommendations from third parties (ie non-manufacturing entities). NAPE has been selecting the most advantageous solutions for a long time for projects / studies / audits and does not promote any specific technology. Thanks to its current activity NAPE S.A. It is perceived as a company that can act as a third party.

Course content

The modern building is not a collection of independent products, but an integrated product whose efficiency is the result of the synergy of all the solutions used. This means that testing a product, such as a window, in isolation from the characteristics of the other building components is not complete. NAPE S.A. conducts a simulation of the effectiveness of the use of building components as components of a complex system, taking into account the characteristics of all products and functions of a building.


The analysis of the efficiency of individual products is based on a series of simulations covering a wide range of constructional parameters such as:

  • characteristics of the building's thermal protection elements
  • ventilation system characteristics
  • characteristics of the heating / cooling system,
  • function and usage of the building.

The effectiveness of individual components is determined by their use in the developed reference buildings. Based on analysis of the construction market in Poland NAPE S.A. developed the characteristics of a reference building for both multi-family and single-family housing. The NAPE Reference Buildings tab provides the basic assumptions for both reference buildings, as well as links to detailed information on NAPE reference buildings along with a description of the energy consumption simulations and the performance of assessed systems (NAPE multi-family and single-family housing).

Energy efficiency categories NAPE

The NAPE's energy efficiency category must be checked for compliance with the minimum operating conditions defined in the Polish legislation, such as air flow, internal air temperature, and others.

An energy efficiency assessment is a comparison of the annual energy consumption (heating / cooling, drives) in a multi-family residential building equipped with a rated energy consumption system in the same building with reference systems according to the definition of a single or multi-family NAPE building.

Based on the results of the simulation, the division into energy efficiency categories of NAPE follows the following guidelines:

  • energy consumption for a reference building is a reference level of 100% - reference level for primary energy consumption,
  • the result of building energy consumption excluding consumption related to the particular component (e.g. lack of ventilation system, lack of hot water preparation, infinite thickness of insulation material, etc.) represents 0% reference level,
  • a score of 0% to 30% inclusive means energy efficiency category NAPE - A1,
  • a score of 30% to 50% inclusive means the energy efficiency category NAPE - A2,
  • a score of 50% to 70% inclusive means the energy efficiency category NAPE - B1,
  • a score of between 70% and 90% inclusive means the energy efficiency category NAPE - B2,
  • a score of between 90% and 110% inclusive means the energy efficiency category NAPE – C,
  • a score of more than 110% indicates the NAPE - D energy efficiency category.

NAPE Recommendation

Systems that have achieved the NAPE A1, A2 and B1 energy efficiency category (at least 30% energy savings compared to the reference level) are recommended for use by the National Energy Conservation Agency. Systems with a NAPE recommendation may be marked with a recommendation logo until changes in Technical Conditions or technical changes affecting the energy efficiency of the rated system are made.