Daylight savings time proponents argue that electricity is saved because of longer days, meaning less artificial light is needed. It makes sense to look not only at the impact on electricity savings in lighting, but on a building’s overall energy consumption. Employees start working an hour earlier in summer due to the time change, thus leaving the office earlier in the afternoon. Since most cooling happens later in the afternoon, this can save energy. In an empty office it can be reduced or turned off. As buildings become more intelligent, this would be relatively easy with daylight-saving reducing an office building’s cooling energy by up to almost six percent. Concurrently, heating demand can increase by up to 4.4 percent due to the morning’s earlier start of work. However, since much more cooling than heating energy is needed in summer, the time change has a positive overall effect on a building’s energy balance.
www.sciencedaily.com/releases/2023/03/230321112635.htm