The increase in the energy class of a building from Class G to Class A is not just letters in documentation. It's a real revolution that brings with it many significant benefits for residents and the environment. Indeed, this positive change affects not only the owners themselves, but also the environment. One of the key benefits that can be realistically felt is energy savings. A building's A classification means significantly lower energy consumption for heating and cooling, and this translates not only into lower energy bills, but also reduced carbon dioxide emissions into the atmosphere, which has a significant impact on environmental protection. The increase in energy class also reflects a higher standard of comfort for users. Thanks to better thermal insulation provided by new windows and additional insulation, interiors have become more pleasant in both winter and summer. A constant temperature, no drafts and fewer temperature fluctuations contribute to exceptional living comfort. Health benefits are another aspect worth highlighting. Improved thermal insulation translates into better living conditions, and reduces the risk of mold and mildew. Overall, the change in energy rating from G to A is a significant step toward more sustainable and comfortable living. It's not just about saving money, it's also about taking care of the environment, as well as improving living comfort and transforming a building into a more energy-efficient and environmentally friendly place is a definite step toward a better future.