Reason: 3 Marks
A house needs to be well ventilated for the comfort of its residents and to help care for the building. A house with poor ventilation can retain moisture and feel draughty or airless. Moisture can condense, leading to problems, while inadequate air flow results in a build-up of indoor air pollutants from household products. It can also produce cold, uncomfortable indoor temperatures, while good ventilation can help to maintain a comfortable inside temperature and a fresh and healthy home. A whole house ventilation system is more convenient than simply opening a window because it allows you to control the flow of fresh air and does not present a security risk.