What is a common method of improving energy efficiency in HVAC systems?

Adding insulation is a highly effective method for improving energy efficiency in HVAC systems. Insulation helps to minimize heat transfer between the inside of a building and the outside environment. By properly insulating walls, attics, and ducts, a building can maintain its desired temperature with less energy consumption. This reduction in energy use not only helps to lower utility bills but also decreases the workload on HVAC systems, potentially leading to a longer lifespan for the equipment and enhanced indoor comfort.

In contrast, using older equipment generally results in inefficiencies due to outdated technology, while reducing maintenance can lead to system breakdowns and additional energy waste. Increasing system size without proper calculations can result in short cycling, where the system turns on and off frequently, leading to energy inefficiency and potential wear and tear issues. Thus, adding insulation is a strategic and practical solution to enhance the energy efficiency of HVAC systems.