Every home is different, but as the norm, the roof cavity in most homes will heat up during the day (depending on your state, roofing material, orientation to the sun and tree shading). On a sunny winter’s day, the temperature in the roof cavity could be more than ten degrees higher than the outside air temperature. With a Ventis Ventilation system installed, you have the ability to set your preferred indoor air temperature, and when the heat becomes available in the roof space, Ventis will utilise it for home heating.