Nonducted

Nonducted is an adjective used to describe systems or devices that distribute air, gas, or conditioned air without using a network of ducts. In heating, ventilation, and air conditioning (HVAC), nonducted systems deliver conditioned air directly to spaces rather than through a centralized ductwork system. Common nonducted configurations include ductless heat pumps and mini-split systems, which consist of an outdoor condenser connected to one or more wall- or ceiling-mounted indoor units, and non-ducted units such as window air conditioners and portable air conditioners that operate within individual rooms.

Nonducted cooling and heating is often contrasted with ducted systems, where air is routed via ducts to multiple rooms. Nonducted systems are popular in upgrades and renovations where retrofitting ducts is impractical, or where zoning and targeted comfort are priorities. They can offer energy savings by reducing duct losses and allow easier installation in buildings without existing ductwork.

Disadvantages can include higher initial cost when multiple indoor units are required, potential uneven cooling between rooms if not properly configured, and aesthetic considerations due to visible units. Performance depends on proper sizing, heat load, and outdoor climate; some portable units require external venting.

Other uses of the term nonducted appear in product descriptions to indicate absence of integrated duct distribution, as opposed to ducted or centralized units. In summary, nonducted denotes air delivery without conventional duct networks, most commonly referring to ductless HVAC solutions and single-room or portable appliances.