During the energy audit, what should a technician observe about windows?

During an energy audit, a technician's primary focus regarding windows should be on their functionality and sealing effectiveness. This is pivotal because the role of windows in a building's energy efficiency is significant; they can be sources of heat loss in the winter and heat gain in the summer if not properly sealed and functional.

By assessing the sealing effectiveness, the technician can identify any air leaks that might compromise the thermal envelope of the building, leading to increased heating and cooling costs. Also, observing the functionality ensures that windows can open and close properly, providing not just comfort but also ventilation control, which is essential for maintaining indoor air quality.

While aesthetic qualities, energy label ratings, and the type of glass used can offer some insights, they do not directly pertain to the immediate effectiveness of the windows in conserving energy or maintaining a comfortable indoor environment, making functionality and sealing the most critical factors to evaluate during an energy audit.