Why are we talking so much about energy efficiency today?
Energy efficiency is no longer a trend; it has become a quality standard.
In a context of growing concern about climate change, energy dependence, and the cost of living, energy-efficient homes are more than just a smart choice: they are a real necessity and a differential value.
Spain, as part of the European Union, has adopted increasingly strict regulations to ensure that new buildings consume less energy and, at the same time, are more comfortable, sustainable, and affordable in their daily use.
Within this framework, category A energy certification stands as an indicator of excellence, both from a technical and a market perspective.
Developments such as Edificio Sol and Edificio Norte, developed by Marina d'Or Construcciones, not only meet these standards, but exceed them.
They are tangible examples of how it is possible to live better while consuming less, with architectural and technological solutions designed for the future.
What is the Energy Performance Certificate and why is it important?
The Energy Efficiency Certificate (EEC) has been a mandatory official document in Spain since 2013 for all homes that are sold or rented.
It assesses the energy performance of a building or part of a building (for example, an individual home within a block), assigning it a letter between A (most efficient) and G (least efficient).
The rating is obtained through a standardized technical procedure that analyzes:
- The annual consumption of non-renewable primary energy (Cep,nren).
- Carbon dioxide emissions (kg CO₂/m² year) associated with the use of the property.
- The characteristics of the thermal envelope (facades, roofs, windows).
- The efficiency of the air conditioning, ventilation, domestic hot water (DHW) production, and lighting systems.
The certificate is valid for 10 years and must be issued by a competent technician, following the methods approved by the Ministry for Ecological Transition and the IDAE (Institute for Energy Diversification and Saving).
Energy scale from A to G: what does each letter mean?
The energy efficiency scale allows for a clear and visual comparison of the energy performance of different homes. Below, we explain what each letter represents:
| Category | Color | Energy consumption and emissions | Approximate Cep,nren value |
|---|---|---|---|
| A | Dark green | Excellent energy performance | ≤ 28 kWh/m² per year |
| B | Light green | Very good | ≤ 50 kWh/m² per year |
| C | Yellow | Good | ≤ 80 kWh/m² per year |
| D | Orange | Medium | ≤ 120 kWh/m² per year |
| E, F, G | Red | Low to very low performance | > 120 kWh/m²year |
As can be seen, the difference between a class A and a class D home can mean four times less energy consumption.
In euros, this can translate into several hundred or even thousands per year, depending on the size of the property and energy prices.
In addition, a class A home usually incorporates clean technologies, such as aerothermal energy or photovoltaic solar panels, while class G homes are likely to rely on gas boilers, conventional electrical systems, and poor insulation.
How do you achieve a Class A home? Determining factors
To achieve Class A status, the home must incorporate a consistent design in all phases: architectural design, material selection, construction, and installations.
A single measure is not enough; a holistic approach is required. These are the main influencing factors:
1. High-performance thermal envelope
The envelope is the set of elements that separates the interior from the exterior (facades, roofs, floors, windows). An efficient envelope reduces heat loss in winter and heat gain in summer.
Both the Sol Building and the North Building have:
- Thermal insulation using an 8 cm ETICS (External Thermal Insulation Composite System).
- Facades without significant thermal bridges.
- Insulated inverted roofs, which also improve protection against moisture.
- High-density thermal insulation screeds.
2. High-performance windows
Windows are one of the critical points in energy loss. To comply with standard A, they must incorporate:
- Thermal break in the profiles (PVC in the South Building, lacquered aluminum in the North Building).
- Double glazing with a dehydrated air chamber and low-emissivity glass, which improves thermal efficiency without losing brightness.
- Adequate sun protection to reduce heat gain in summer.
3. Efficient air conditioning and DHW systems
Both buildings use aerothermal energy, a technology that extracts energy from the outside air to heat or cool the interior and produce hot water. This system performs much better than conventional boilers and is considered renewable energy according to European Directive 2009/28/EC.
The systems are designed to supply:
- High-efficiency, low-consumption domestic hot water.
- Integrated and silent ducted air conditioning.
- Heat recovery through dual-flow ventilation, which reduces the need for additional heating or cooling.
4. Use of renewable energy
Both developments have photovoltaic installations to provide energy support in common areas. In addition, aerothermal energy is already a recognized renewable source.
This set of solutions means that, according to official documents, renewable energy accounts for over 88%of the DHW demand.
Specific benefits of living in an energy-efficient Category A home
We have discussed data, standards, and technology. Now it is time to analyze what really matters to the buyer or user of a home: the tangible benefits that an A-rated home provides on a daily basis.
1. Direct and indirect financial savings
Energy efficiency is not just an environmental issue, it is also a strategic economic decision. Various studies by the IDAE and the Ministry of Ecological Transition have estimated that a class A home can save between 60% and 80% of energy consumption compared to a class E or lower home.
These savings depend on usage, size, and location, but they are consistent over time.
Practical example:
- An average 90 m² home with a conventional system can consume more than €100/month in air conditioning and hot water.
- In a class A home, such as Edificio Sol or Norte, consumption can be reduced to less than €30–40/month under the same conditions.
Added to this are indirect benefits:
- Less dependence on volatile energy prices.
- Easier maintenance of modern equipment (such as aerothermal systems).
- Fewer incidents due to humidity or condensation, which also saves on repairs.
2. Thermal and acoustic comfort throughout the year
A Class A home not only consumes less energy, it is also more comfortable. This is due to its ability to maintain a stable temperature throughout the year, without major fluctuations and without the need to constantly rely on active air conditioning systems.
This is especially noticeable in:
- Intense summers: SATE insulation and solar control glass reduce heat gain.
- Cold winters: thermal breaks and heat recovery minimize losses.
These elements also improve sound insulation, which is highly valued in urban or tourist environments.
3. Property revaluation
More and more buyers and investors value energy ratings as a determining factor in their purchasing decisions. This is due to both the savings they offer and their alignment with European decarbonization policies.
A property with energy efficiency rating A:
- Has a higher market value.
- Offers better mortgage conditions at some financial institutions that apply sustainability criteria.
- Complies in advance with future European regulatory requirements (EPBD Directive), which protects its long-term value.
4. Sustainability and real contribution to the environment
Class A homes not only reduce energy consumption: they also drastically reduce CO₂ emissions associated with residential use.
This is no small matter: the building sector accounts for almost 40% of total energy consumption and around 36% of greenhouse gas emissions in Europe.
In Marina d'Or developments:
- The combination of aerothermal energy + photovoltaics + comprehensive insulation achieves a minimal emissions profile.
- The requirements of the CTE (Technical Building Code) in its basic energy saving document (DB HE) are exceeded.
- They are aligned with the nZEB (Nearly Zero Energy Building) standard, which will be mandatory in new construction from 2021.
Sol Building: live better, live differently
Verified data:
- Cep,nren (non-renewable primary energy consumption): 11.36 kWh/m² per year.
- Official energy label: A.
- Contribution of renewables to DHW: 88.69%.
- Location: residential area with high tourist and permanent demand.
Key technical features:
- SATE-type thermal insulation on the façade (8 cm), with high-quality exterior finishes.
- Insulated inverted roof, improving protection against the elements.
- PVC exterior carpentry with triple joints and low-emissivity double glazing with argon gas.
- Aerothermal system for ducted air conditioning and DHW production.
- Dual-flow ventilation with heat recovery, improving the efficiency of the overall system.
- LED lighting in common areas, with presence sensors.
- Installation of photovoltaic solar panels for electricity consumption in common services.
- Pre-installation for charging electric vehicles in garages.
Additional details:
- High-end interior finishes: SPC flooring, designer bathrooms, fitted kitchen.
- Basic home automation with temperature and opening control.
- Orientation designed to maximize natural lighting.
North Building: efficiency from the ground up
Verified data:
- Cep,nren: 10.57 kWh/m² per year.
- Official energy label: A.
- Location: high-value urban area with modern amenities.
Key technical features:
- SATE system on the façade, thermal insulation on the roof and floors.
- Lacquered aluminum exterior carpentry with thermal break.
- Double glazing with solar control and low emissivity.
- Aerothermal system for DHW and ducted air conditioning.
- Heat recovery in ventilation, improving overall efficiency.
- Photovoltaic solar panels for common areas.
- 15% of parking spaces with pre-installation for electric vehicle charging, expandable to 100% with metal tray.
Practical advantages:
- Significant improvement in thermal and acoustic comfort.
- Homes ready to comply with the nZEB standard.
- Real and measurable savings in everyday use.
- Longer service life of materials and installations.
The future of housing revolves around three key concepts: sustainability, technology, and savings. But all of this must be tangible, documented, and verifiable. Edificio Sol and Edificio Norte are just that.
They are built with high-efficiency materials, incorporate innovative climate control systems such as aerothermal energy, harness solar energy, and comply with the criteria of the Technical Building Code, all with a confirmed A energy rating.
We are not talking about "greenwashing" or empty promises. These buildings are an example of how you can live more comfortably, consume less energy, and protect the value of your investment without sacrificing design or quality.
If you have the opportunity to choose a home with these characteristics, don't hesitate: energy efficiency is not just a concept, it is a real advantage that you will notice from day one.
Marina d'Or Construcciones has understood the needs of the modern buyer and turned them into reality.
