Adelaide Heating and Cooling Over 20 years delivering perfect comfort to Adelaide homes. Ducted reverse cycle air conditioning is a closed system where the air is recirculated through an indoor unit mounted in the ceiling space. It can be ducted to the whole home with zones to close off rooms when not required, which maximises the efficiency of the system. Ducted gas central heating is a ducted system which can heat the whole home and can be zoned to turn rooms off when not in use. Ducted gas central heaters are flued to the outside. Gas wall furnace heaters can heat any sized room, in a variety of configurations. If you need to replace an existing wall furnace, our gas wall furnaces are an ideal replacement. Wall furnaces are flued, so exhaust gases are expelled outside.