Warm air heating systems were once a popular choice for heating domestic properties, particularly in the 1960s and 1970s. Back then, they were deemed highly reliable compared to other heating systems of the era. However, with the advancement of technology and the introduction of today's 'wet' central heating systems, such as gas boilers and radiators, these older warm air systems have become outdated. They no longer offer the same level of efficiency, comfort, and controllability that modern heating systems provide.