Energy retrofits can include a variety of measures, such as:

1. Thermal insulation: Improving the insulation of walls, ceilings, floors, and windows to reduce heat loss in winter and heat gain in summer.
2. Renovation of heating and cooling systems: Replacing obsolete equipment with more efficient and energy-efficient systems, such as condensing boilers, heat pumps, or solar thermal systems.
3. Lighting upgrade: Switching to efficient lighting technologies, such as LED bulbs, which consume less energy and have a longer lifespan.
4. Energy management: Install control and management systems to optimize energy use in the building, such as programmable thermostats, motion sensors, and automation systems.
5. Use of renewable energy: Incorporate renewable energy sources, such as photovoltaic solar panels or wind energy systems, to generate electricity and reduce dependence on conventional energy sources.
6. Efficient ventilation systems: Implement controlled ventilation systems that help maintain indoor air quality and minimize heat loss.
7. Facade renovation: Modify facades to improve their insulation and tightness, thus reducing thermal losses.