Which of the following is NOT a cause of pressure differences in a home?

The solar effect is not typically considered a direct cause of pressure differences within a home. While solar gains can impact indoor temperatures and contribute to overall thermal comfort, the pressure differences are more commonly influenced by physical forces and mechanisms such as the wind, stack effect, and mechanical ventilation systems.

Wind effect refers to how wind interacts with a building's surfaces, leading to variations in air pressure on windward and leeward sides. The stack effect is the movement of air due to temperature differences, where warm air rises and creates a pressure difference between the lower and upper parts of the structure. Mechanical ventilation actively alters indoor pressures by introducing or exhausting air, causing potential changes in pressure from specified vents.

On the other hand, the solar effect primarily concerns the heating and cooling of surfaces and does not directly create pressure variations like the other factors do. Therefore, it is the least relevant to the topic of pressure differences within a home.