What is the method known as 'retro-commissioning'?

Retro-commissioning is defined as a systematic process aimed at improving the energy efficiency of existing buildings. This method involves assessing the current performance of a building's systems, such as heating, ventilation, and air conditioning (HVAC), lighting, and building controls, to identify opportunities for optimization. The process typically includes detailed analysis, testing, and adjustment of systems to ensure they are functioning as intended and achieving optimal operational efficiency.

This practice is particularly valuable in older buildings where systems may not have been updated to reflect modern efficiency standards or may not be working together synergistically. By focusing on existing systems rather than new constructions or equipment purchases, retro-commissioning helps building owners and facility managers make informed decisions that can lead to significant energy savings, reduced operational costs, and enhanced occupant comfort.

The other choices do not accurately represent the nature of retro-commissioning. It is not related to new construction or simply a maintenance strategy, nor does it pertain specifically to purchasing new equipment. Instead, it is a targeted approach to maximizing the efficiency and functionality of what is already in place.