Increasing energy efficiency in existing buildings can often lead to what benefit?

Increasing energy efficiency in existing buildings primarily leads to environmental benefits and cost savings. By implementing energy-efficient systems and practices, buildings consume less energy, which can significantly reduce utility costs over time. This reduction not only lessens the financial burden on building owners and occupants but also contributes to decreased greenhouse gas emissions and other environmental impacts associated with energy production and consumption.

Moreover, energy-efficient upgrades often enhance the overall comfort and functionality of a space, thereby increasing its value and appeal. Enhanced efficiency can also prolong the lifespan of existing systems and reduce the need for maintenance, further leading to cost savings and financial benefits.

The other options do not align as well with the expected outcomes of increasing energy efficiency, which is why they fall short in comparison. Higher upfront costs may be a consideration during initial investments, but the long-term savings typically offset this expense. Increased energy consumption contradicts the aim of energy efficiency, and while more complex building operations could indeed arise from certain technologies, the primary benefits are centered around savings and environmental impact.