An air conditioning indoor unit that blows air, which has exchanged heat with a refrigerant flowing through a heat exchanger, into an air conditioning target space, includes: a liquid refrigerant pipe and a gas refrigerant pipe that are connected to the heat exchanger; a casing that accommodates the heat exchanger and that has an opening communicating with the air conditioning target space; a first shutoff valve in the liquid refrigerant pipe; a second shutoff valve in the gas refrigerant pipe; and a partition wall that separates a first space from a second space in the casing. The first shutoff valve and the second shutoff valve are in the first space. The second space communicates with the air conditioning target space via the opening.

An air conditioning indoor unit that blows air, which has exchanged heat with a refrigerant flowing through a heat exchanger, into an air conditioning target space, includes: a liquid refrigerant pipe and a gas refrigerant pipe that are connected to the heat exchanger; a casing that accommodates the heat exchanger and that has an opening communicating with the air conditioning target space; a first shutoff valve in the liquid refrigerant pipe; a second shutoff valve in the gas refrigerant pipe; and a partition wall that separates a first space from a second space in the casing. The first shutoff valve and the second shutoff valve are in the first space. The second space communicates with the air conditioning target space via the opening.

A heating, ventilation, and/or air conditioning (HVAC) packaged unit includes a first refrigerant circuit component configured to change a temperature or a pressure of a refrigerant flowing through the first refrigerant circuit component and a second refrigerant circuit component configured to change a temperature or a pressure of the refrigerant flowing through the second refrigerant circuit component. The first and the second refrigerant circuit components are within a common refrigerant circuit that is disposed within a common support structure. The HVAC packaged unit also includes an interconnection conduit having a length formed from aluminum, a first end segment coupled to a first end of the length, and a second end segment coupled to a second end of the length. The first end segment and the second end segment are each formed from copper, and the interconnection conduit extends between the first refrigerant circuit component and the second refrigerant circuit component.

An air conditioner includes: a heat-source-side unit including a heat-source-side heat exchanger; a use-side unit, in a space to be air conditioned, including a use-side heat exchanger and a use-side fan that supplies air to the use-side heat exchanger; and a connection pipe that connects the heat-source-side unit to the use-side unit. The air conditioner performs air-conditioning of the space by circulating refrigerant in a refrigerant circuit including: the heat-source-side heat exchanger; the use-side heat exchanger; and the connection pipe. The refrigerant circuit further includes: a first pipe made of a first metal material; a second pipe made of a second metal material; and a connecting portion between the first pipe and the second pipe. The connecting portion is in an unventilated space.

A packaged terminal air conditioner unit includes an inlet conduit coupled to a compressor at an accumulator of the compressor. An outlet conduit is coupled to the compressor at a discharge of the compressor. The discharge of the compressor is positioned at a top portion of the compressor. The outlet conduit extends upwardly along a vertical direction from the discharge of the compressor between a pair of angled segments of the inlet conduit. The pair of angled segments of the inlet conduit is positioned above the compressor along the vertical direction.

A packaged terminal air conditioner unit includes an inlet conduit coupled to a compressor at an accumulator of the compressor. An outlet conduit is coupled to the compressor at a discharge of the compressor. The discharge of the compressor is positioned at a top portion of the compressor. The outlet conduit extends upwardly along a vertical direction from the discharge of the compressor between a pair of angled segments of the inlet conduit. The pair of angled segments of the inlet conduit is positioned above the compressor along the vertical direction.

A split air conditioner having an indoor unit and an outdoor unit. A piping system interconnects the indoor unit with the outdoor unit. The indoor unit has an indoor heat exchanger for cooling or heating air in the indoor unit. The outdoor unit has a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger. The compressor is configured to drive a refrigerant via the first outdoor heat exchanger and the second outdoor heat exchanger in a refrigerant circuit. The piping system is configured to circulate an energy transport media from the first outdoor heat exchanger via the piping system to the indoor heat exchanger.

A split air conditioner having an indoor unit and an outdoor unit. A piping system interconnects the indoor unit with the outdoor unit. The indoor unit has an indoor heat exchanger for cooling or heating air in the indoor unit. The outdoor unit has a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger. The compressor is configured to drive a refrigerant via the first outdoor heat exchanger and the second outdoor heat exchanger in a refrigerant circuit. The piping system is configured to circulate an energy transport media from the first outdoor heat exchanger via the piping system to the indoor heat exchanger.

A split air conditioner having an indoor unit and an outdoor unit. A piping system interconnects the indoor unit with the outdoor unit. The indoor unit has an indoor heat exchanger for cooling or heating air in the indoor unit. The outdoor unit has a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger. The compressor is configured to drive a refrigerant via the first outdoor heat exchanger and the second outdoor heat exchanger in a refrigerant circuit. The piping system is configured to circulate an energy transport media from the first outdoor heat exchanger via the piping system to the indoor heat exchanger.

A split air conditioner having an indoor unit and an outdoor unit. A piping system interconnects the indoor unit with the outdoor unit. The indoor unit has an indoor heat exchanger for cooling or heating air in the indoor unit. The outdoor unit has a compressor, a first outdoor heat exchanger, and a second outdoor heat exchanger. The compressor is configured to drive a refrigerant via the first outdoor heat exchanger and the second outdoor heat exchanger in a refrigerant circuit. The piping system is configured to circulate an energy transport media from the first outdoor heat exchanger via the piping system to the indoor heat exchanger.