Shading and Ventilation

The tighter a building is sealed against draughts, the better the thermal performance.  You will save on energy costs and this is what your aim should be however, it is important to be aware of air quality. The air in your home can contain pollutants or allergens that may affect your health.  Air pollutants may be gases or particles, and may come from man-made sources or occur naturally.

On average, every Australian spends around 90% of their time indoors.  But, if you think that’s frightening consider this – a number of studies have found that the air indoors (where we spend most of our time) is generally more polluted than the air outside (where we spend about 10% of our time)! This is due in large part to the presence of a variety of Volatile Organic Compounds (VOCs) in the air indoors. Poor indoor air quality can also result from numerous factors, including inadequate ventilation, poorly designed or maintained air conditioning systems, chemicals or even vehicle exhaust fumes drawn in from outside, leaking gas appliances and microbial contamination.

During days when heating is not required, opening doors and windows for air changes is a way of removing air pollutants.  During those days when heating is required, opening external doors for a few minutes will help maintain fresher air.  The idea here is to not leave them open for long periods and lose heat from within the building.