You have spent thousands of euros on the interior design of your new home or commercial space. You have carefully selected the lighting, colours and furniture. And suddenly, you realise you need to hang a huge, plastic air conditioner on the most prominent wall - one that screams its presence.
The solution to this aesthetic nightmare is Ducted Air Conditioning. It represents the pinnacle of luxury cooling, where the unit disappears entirely inside the ceiling, and cool or warm air diffuses into the space through elegant, thin slots (linear diffusers).
However, "hiding" an air conditioner is not a simple affair. It requires serious mechanical engineering design, correct ductwork calculation and close collaboration with the architect. Let us see how ducted systems work and what the 3 golden rules are so you don't regret your choice.
Unlike a standard wall-mounted air conditioner (which draws in and blows air directly from its body), a ducted unit is a large, metal box that is permanently hidden inside a false ceiling (usually plasterboard) in the hallway, bathroom or entrance area of the home.
From this "invisible" unit, special tubes (ducts or "channels") travel hidden inside the ceiling and terminate at the various rooms. At the end of each duct, a grille or diffuser sits flush with the plasterboard, through which air exits silently into the room.
A single ducted unit can supply multiple rooms simultaneously via the ductwork. You can have one diffuser above the sofa, another above the dining table and a third in the kitchen - all controlled by a single concealed unit.
Ducted air conditioning is not simply an alternative to a standard wall-mounted split. It is an entirely different philosophy: the unit vanishes and the climate control becomes an integral part of the architecture.
The unit simply does not exist in your field of vision. Instead of a plastic lump, you have only discreet Linear Slot Diffusers. These can be painted to match the wall colour, run around the perimeter of the living room or be integrated with concealed lighting, delivering a stunning, minimal result.
With a wall-mounted unit, if you sit directly below it you freeze, while at the other end of the room you roast. With a ducted system, air is distributed intelligently through multiple diffusers. The temperature is perfectly identical in every square metre of the space. No more "cold drafts" and "hot corners".
Because the unit itself (and its fan) is hidden far away - e.g. in the bathroom ceiling or hallway - behind sound-insulating plasterboard, in the bedroom you hear only a gentle, imperceptible whisper of air emerging from the diffuser. Ideal for light sleepers.
Installing a ducted system is a mechanical engineering project. If the technician cuts corners, the problems will be enormous. Here are the 3 non-negotiable rules.
You cannot install a ducted system in a flat with low-ceiling rooms (e.g. 2.60m). To conceal the unit and route the insulated ducts, the plasterer needs to lower the ceiling by 30 to 40 centimetres. If you don't have that headroom, the space will feel claustrophobic. This is why ducted units are typically installed in new builds or homes with generous ceiling heights.
The air must travel through narrow ducts for several metres, creating resistance (Static Pressure). If the installer uses ducts that are too narrow to save space or money, the air will constrict, accelerate and the diffusers will start whistling annoyingly. Correct duct sizing by a mechanical engineer and the use of plenum boxes behind the diffusers are essential.
For the AC to blow cool air (supply), it must first draw in the room's warm air (return). Many people forget to design return air grilles. The result? The unit, sealed inside the plasterboard, "chokes" from lack of air, underperforms, and sucks in dust and odours from the ceiling void. Every room with a supply diffuser must also have a return slot.
A ducted air conditioner needs filter cleaning every 6 months and possible circuit board maintenance. If you "bury" it permanently under the plasterboard, the technician will have to demolish the ceiling to service it!
It is absolutely mandatory to build an access panel (hatch) in the plasterboard, directly below the unit. Today, flush-mounted hatches (with no visible frame) are available that are painted to match the ceiling colour and open with a simple push (push-to-open), keeping the aesthetics flawless.
Ducted air conditioning is the ultimate "premium" choice. It rewards the owner with perfect temperature and flawless architecture, provided that the mechanical engineer, refrigeration technician and plasterboard installer work as a well-oiled team. In the next article, we solve the suffocation problem: Fresh Air Introduction in Ducted Systems.
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