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Energy Certification

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Energy Certification

Energy certification is a technical process that assesses and classifies the energy performance of a building, based on the efficiency of its heating, ventilation, air conditioning, lighting, and other factors influencing energy consumption. The goal of certification is to promote responsible energy use, identify areas for improvement, and contribute to reducing greenhouse gas emissions.

In Portugal, energy certification of buildings is mandatory for all new constructions and also for existing buildings that are sold or leased. It is regulated by the Building Energy Certification System (SCE), under the guidance of the Agency for Energy (ADENE).

 

Objectives of Energy Certification

  • Evaluation of Energy Efficiency: Energy certification aims to evaluate the energy consumption of a building, determining how its systems and materials contribute to the building’s energy efficiency.

  • Reduction of Energy Consumption: Through certification, it is possible to identify areas where the building can improve in terms of energy consumption, such as better thermal insulation or the installation of renewable energy systems.

  • Promotion of Sustainability: Energy certification promotes more sustainable building practices by encouraging reduced environmental impact and more rational use of energy resources.

  • Increase in Property Value: A building with a good energy rating tends to be more valuable on the market, as consumers are increasingly concerned about energy efficiency and the associated costs of energy consumption.

 

How Energy Certification Works

  • Technical Evaluation: The certification process involves a detailed analysis of the building, considering aspects such as:

    • The structure and thermal insulation (walls, windows, roofs);

    • The heating, ventilation, and air conditioning systems;

    • The efficiency of lighting systems and types of lighting used;

    • The use of renewable energy (such as solar panels or geothermal systems, if available);

    • Water consumption and building materials.

  • Calculations and Classification: Through specific calculations, the amount of energy needed to heat, cool, and light the building is determined, considering the local climate and the building’s characteristics. The energy performance is then classified on a scale from A+ (very efficient) to F (very inefficient).

  • Energy Certificate: After the evaluation, an energy certificate is issued, containing the building’s energy classification, as well as suggestions for improvements to enhance energy efficiency. This certificate is valid for 10 years but should be updated whenever significant changes are made to the building.

 

Types of Energy Certification

  • New Buildings: All new buildings or major renovation projects must undergo energy certification before they are sold or leased. Certification is part of the construction licensing process.

  • Existing Buildings: For existing buildings, energy certification is required when the property is put on the market for sale or lease. The owner or real estate agent must provide the certificate to the buyer or tenant.

 

Benefits of Energy Certification

  • Cost Reduction: An energy-efficient building reduces electricity, heating, and air conditioning costs, which benefits both owners and occupants.

  • Improved Comfort: A building with good energy certification tends to have more stable interior temperatures, better thermal and acoustic insulation, contributing to occupant comfort.

  • Increase in Property Value: Properties with a good energy rating are more attractive to potential buyers or tenants, especially in markets where consumers are increasingly aware of the environmental impact and energy costs.

  • Legal Compliance: Energy certification is a legal requirement, and complying with it avoids fines and legal issues for the building owner.

  • Contribution to Sustainability: Energy certification contributes to reducing the environmental impact of buildings, encouraging the use of renewable energy and more efficient building practices.

 

Energy Classification

The energy classification of a building is expressed on a scale ranging from A+ (very efficient) to F (very inefficient). The evaluation process considers factors such as energy consumption, renewable energy use, thermal insulation, and building type.

  • A+ to A: Highly efficient buildings with low energy consumption.

  • B: Efficient buildings, but with slightly higher energy consumption.

  • C to E: Buildings with average to high energy consumption, which may require improvements.

  • F: Buildings with high energy consumption, requiring significant improvements to increase efficiency.

 

Suggested Improvements to Increase Energy Efficiency

After the certification, the report may include recommendations to improve the building’s energy efficiency, such as:

  • Improving thermal insulation (walls, windows, doors);

  • Replacing heating and air conditioning systems with more efficient solutions;

  • Installing solar panels or other renewable energy systems;

  • Improving the ventilation system to increase air circulation without excessive energy use;

  • Replacing conventional lighting with more efficient LED lights.

 

Conclusion

Energy Certification is an important tool for assessing and improving the energy efficiency of buildings, contributing to sustainability, reducing energy costs, and increasing property value. By complying with legal requirements and adopting energy-efficient practices, building owners and occupants can reduce their environmental impact and improve comfort in residential and commercial spaces.

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