7671 Window-mounted, wall-mounted and subfloor air-conditioning units (4) Self-contained window-mounted, wall-mounted and subfloor air-conditioning units providing conditioned air to a room or space 7672 Free-standing air-conditioning units (2) Self contained free-standing air conditioning units providing conditioned air to rooms and/or spaces 7673 Split air-conditioning units (45) Unitary air conditioning systems of the "split" direct expansion type 7676 Hybrid air conditioning systems (0) Unitary air conditioning systems, other than standard air types, does include hydronic types such as air to water and water to air, etc. Excludes direct hot water space heating and sanitary hot water supply.