Home ventilation strategies during a heatwave

During a heatwave, the timing of home ventilation is critical for maintaining cool indoor temperatures. The primary rule is to open windows only when the outdoor air is cooler than the indoor air, typically during the early morning, evening, or night.

To prevent heat from entering, windows and external shading—such as shutters or screens—should be closed during the day, especially in rooms receiving direct sunlight. Creating a draft by opening windows on opposite sides of a house can help circulate air and remove warmth more effectively.