The Unico System is a mini-duct central heating and air conditioning system that utilises compact, modular air handlers and flexible 88-mm outer diameter (50-mm inner diameter) supply tubing to supply conditioned air to homes and commercial spaces. The flexible supply tubing snakes through a structure's existing cavities, eliminating the need for extensive remodeling or the construction of soffits or other concealments. This tubing terminates in round, 131-mm outer diameter (50-mm inner diameter) plastic or wood outlets, about the size of a CD, that can be painted or stained to match any décor. A 13-mm by 200-mm slotted outlet is also available. The Unico System is 1/3 the size of conventional HVAC systems and can fit into smaller spaces. Once installed, the system is virtually invisible.