Which of the following would raise a building's balance point?

Raising a building's balance point involves improving its ability to maintain comfortable indoor temperatures while reducing energy consumption. Adding additional insulation is effective for achieving this because it enhances the building's overall thermal performance. By improving insulation, heat loss during colder months is minimized, which means that the heating system needs to operate less frequently to maintain a comfortable temperature.

Adding insulation leads to a more stable indoor environment, allowing the building to retain heat more effectively. As a result, the balance point—the outside temperature at which the building's existing heating sources can maintain a comfortable indoor environment—can shift to a higher temperature. This means that the heating system won't have to kick in until it is colder outside, leading to reduced energy use and increased efficiency.

In contrast, adding more windows or removing insulation would likely decrease the balance point because these actions can lead to greater heat loss or increased heat gain, depending on the season. Increasing the efficiency of the heating system would improve performance but wouldn't directly raise the balance point in the same way additional insulation does.