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Proper insulation is crucial in a building primarily because it improves energy efficiency. This means that insulation helps to maintain a stable indoor temperature by reducing heat loss in the winter and minimizing heat gain in the summer. By keeping the temperature steady, insulation reduces the amount of energy required for heating and cooling systems to operate, leading to lower energy bills and a reduced carbon footprint.

With effective insulation, the building envelope effectively traps the desired conditioned air inside while preventing unconditioned air from seeping in or out. This not only enhances comfort for the occupants but also means that HVAC systems do not have to work as hard, extending their lifespan and reducing maintenance costs.

While proper insulation may have some indirect effects on a building's appearance or air quality, these aspects are not its primary functions. Moreover, although insulation might make certain construction processes more straightforward when incorporated correctly, that is not its main purpose or benefit. Thus, the most significant reason for installing proper insulation in a building is to improve energy efficiency.