Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Object Groupings and Systems (hierarchy name)
4. systems (equipment)
5. [systems by function]

Narrower term/s

• heating systems[+]
  • furnaces (heating components) [NP] [+]
    • warm air furnaces [+]
      • electric furnaces
      • oil furnaces
  • resistance heating
  • hot water heating
  • radiant heating [+]
    • panel heating
    • heat exchangers [NP] [+]
      • coils (heat exchangers) [+]
      • condensers (heat exchangers)
      • borehole heat exchangers
  • solar heating (systems) [+]
    • active solar heating
    • passive solar heating
  • steam heating [+]
    • vacuum heating
  • warm air heating [+]
    • hypocausts
    • forced air heating
    • gravity heating
    • kangs (heating system)
    • ondols
  • heat-distributing units [NP] [+]
    • baseboard units
    • convectors
    • radiators
    • thermal masses
• ventilation (systems)[+]
  • exhaust ventilation (systems)
  • mechanical ventilation (systems)
  • natural ventilation (systems)
  • ventilation system components [NP] [+]
    • ventilators (ventilation components)
    • air filters [+]
      • dry filters
      • viscous impingement filters
    • air-handling units
    • blowers
    • dampers (HVAC components)
    • air distribution systems
    • air diffusers
    • air ducts
    • registers (HVAC components)
    • cowls (ventilation system components)
    • plenum chambers
    • fume hoods
• air conditioning[+]
  • central air conditioning
  • incremental air conditioning
  • air washers [NP]
• air cooling[+]
  • chilled water systems
  • refrigerant systems
  • ice storage systems
  • passive cooling
• HVAC components [NP][+]
  • ventilation system components [+]
    • ventilators (ventilation components)
    • air filters [+]
      • dry filters
      • viscous impingement filters
    • air-handling units
    • blowers
    • dampers (HVAC components)
    • air distribution systems
    • air diffusers
    • air ducts
    • registers (HVAC components)
    • cowls (ventilation system components)
    • plenum chambers
    • fume hoods
  • [cooling, heating and humidifying components] [+]
    • furnaces (heating components) [+]
      • warm air furnaces [+]
    • air washers
    • boilers (HVAC components) [+]
      • hot water boilers
      • steam boilers
    • cooling towers
    • heat pumps [+]
      • solar-assisted heat pumps
      • geothermal heat pumps
    • heat exchangers [+]
      • coils (heat exchangers) [+]
      • condensers (heat exchangers)
      • borehole heat exchangers
    • thermostats
    • radiator enclosures
    • breechings
    • trompes (cooling components)
    • solar thermal panels
    • stovepipes (pipes)
  • heat-distributing units [+]
    • baseboard units
    • convectors
    • radiators
    • thermal masses
• [temporary alphabetical list: HVAC][+]
  • chiller systems
  • coal furnaces
  • dehumidifiers
  • environmental control elements
  • exhaust fans
  • fireboards
  • fireplace dampers
  • fireplace doors
  • hvac boilers
  • hvac coils
  • hvac compressors
  • hvac condensers
  • hvac evaporators
  • hvac filters
  • recirculating fans
  • vent caps
  • ventilation fans
  • ventilator damper

Anotations

Scope note:

Systems that supply the heating, ventilation, and air conditioning to buildings and complexes.