http://cleanair.co.uk/split-and-multi-split-air-conditioning...

"single split air conditioner" vs "multi-split air conditioner"

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Note added at 16時間 (2016-12-26 09:32:06 GMT)
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The main types of Air Conditioning Systems are –

Single Split Air Conditioner
Single split air conditioners are the most common and basic systems installed. They consist of one internal fan coil unit that is connected to an external condensing unit via copper pipes. They are ideal for cooling or heating one room and are usually the most cost effective option to air condition a room.

Multi Split Air Conditioner
A Multi Split system uses multiple internal units that are all connected to one external condensing unit, ideal is space outside is an issue. The amount of internal units is dependent on the number of rooms that require air conditioning and each unit can be individually controlled. This allows each user to either have their system on or off and to set their own required temperature. All indoor units on a multi split system can only work in the same mode. It is not possible to heat one office and cool another.
http://www.bosscooling.co.uk/air-conditioning.html


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Note added at 1日5時間 (2016-12-26 22:36:57 GMT)
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The split air conditioning has at least one unit that sits inside your room. The compressor sits outside of the room, sometimes on the ground or on brackets hung to the wall. Some models come with multiple indoor units that will use one single compressor, this is known as the multi-split air conditioning system.
https://www.quora.com/What-is-the-difference-between-split-a...

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Note added at 1日5時間 (2016-12-26 22:40:58 GMT)
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上記のように"split air conditioner"は、"single split air conditioner"と"multi-split air conditioner"の総称として使用される場合があるようなので、「ペア機」の英訳としては"single split air conditioner"の方が無難でしょうね。

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Note added at 1日13時間 (2016-12-27 06:25:20 GMT)
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The Friedrich 21 500 BTU is a split air conditioner that can be mounted on a wall. It has individual room controls and operates quietly. It has two indoor units.
http://www.manufacturedhomepartsinfo.com/manufacturedhomeair...

What is a Ductless or Mini Split Air Conditioner?
Like central air conditioners, these units have a split design but without an elaborate system of ducts. The split system (also called a mini-split, ductless split, or duct-free system) has at least one unit inside the home (this is the evaporator) and one outdoor unit (the condenser). Small tubes of refrigerant run from the outdoor unit to the indoor units � these are also known as line sets. Indoor units can be wall or ceiling mounted. Ductless splits can be used to cool one zone or multiple zones applying two to four indoor units to one condenser � the indoor units can all be used independently of each other.
https://www.ajmadison.com/guides/air_conditioner/ductless-sp...