What is multi-split (explained simply)
In a multi-split system, you have several indoor units connected to one outdoor unit . DECO describes the connection (copper pipes + electrical conductor per indoor unit) and the condensate flow requirement.
1) Advantage #1: Fewer external units (important in apartments)
The main advantage highlighted by DECO is clear: fewer external machines , which helps when there are architectural limitations or building/condominium regulations.
2) When multi-split makes sense (typical scenarios in Portuguese)
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You want to air condition 2–4 rooms (bedrooms + living room)
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You have limited outdoor space (small balcony).
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The building/condominium is "sensitive" to many units on the facade.
3) Disadvantages / limitations (to avoid regrets)
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Dependence on an external unit : if there is a malfunction, it can affect all rooms (in practice, this weighs heavily in the decision).
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Installation can be more expensive if there is no pre-installation: DECO notes that, without pre-installation, it can be more expensive due to the need to run pipes to each interior.
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Capacity and simultaneous use : in multi-split systems, the external capacity may not be the "pure" sum of the internal capacity; within the DECO community there are discussions about trade-offs between simultaneous use and consumption.
4) Multi-split vs. multiple mono-split: a quick choice
You choose multi-split if:
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The problem is the facade/architecture (want an exterior).
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Do you want aesthetics/less external impact?
You choose multiple mono-split units if:
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You want maximum flexibility and independence per division.
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You have space and the condominium allows it.
FAQ
Is a multi-split system always cheaper?
Not always. DECO reports that, without pre-installation, it can be more expensive because it requires running pipes for each unit.
Does a multi-split system use less energy?
It's not automatic; it depends on usage and sizing (there are cases where the inverted/unequal usage dynamic can influence consumption).