The energy rehabilitation of buildings is a set of measures aimed at improving energy efficiency and reducing the energy consumption of a building. This includes the installation of thermal insulation, the renovation of heating and cooling systems, the incorporation of renewable energies, among other actions.

Energy rehabilitation not only helps reduce energy bills and CO2 emissions, but also improves the thermal comfort of the building occupants and increases its market value by meeting higher energy efficiency standards.

The benefits include lower energy consumption, which translates into long-term economic savings, greater thermal comfort for residents, and a significant reduction in the building's carbon footprint.

Improvements may include the installation of thermal insulation in facades and roofs, the renovation of windows and doors to improve acoustic and thermal insulation, the upgrade of air conditioning systems to more efficient models, and the integration of renewable energies such as solar photovoltaic panels.

Although there may initially be an investment in energy rehabilitation, the savings in energy and maintenance costs over the long term often offset these additional expenses. In addition, the retrofit may include financing options and grants to help mitigate upfront costs.

The steps are as follows:

• Conduct an energy audit to identify areas for improvement.
• Obtain a detailed technical project with possible solutions and costs.
• Convene a neighborhood meeting to discuss and vote on the proposals.
• Apply for available grants and select professionals to carry out the work.

The time varies depending on the magnitude of the project and the measures implemented, but a complete rehabilitation can take from a few months to a year. They are planned to minimize disturbance to neighbors.

In most cases, a qualified majority of the neighbors' meeting is required to approve an energy rehabilitation project, especially if the works affect common elements.

Energy rehabilitation usually increases the value of real estate, as it improves the energy efficiency of the building and the comfort of the homes. In addition, it can improve the building's energy rating, which is a plus in the real estate market.