With the use of technology and knowledge, we conduct tests such as blower door tests. A blower door test consists of a machine used to measure the air tightness of buildings. It can also be used to measure airflow between building zones, to test duct work air tightness and to help physical locate air leakage sites in the building envelope. Also an infrared camera helps us detect where air or heat is lost. Adequate air exchange is important for occupant comfort, health and safety, but most buildings have a far higher rate of air leakage than necessary. The root cause is often poor design and/or construction which allows air to leak in or out. Without thermal imaging, the source of these drafts can be extremely difficult to detect and visualize. But with thermal imagery our auditors can readily uncover the source of the heat issue, leading to helpful advice on the best improvements and repairs to stop energy loss.