Installing air conditioning in an apartment in Luxembourg raises many questions, which often only come up during the installation process: whether an outdoor unit can be installed at all, where it should be placed, how to reduce noise so as not to disturb neighbours, how to safely drain condensate, and whether approval from the property management company or homeowners’ association is required for any intervention in the façade or common areas of the building. The good news is that the air-conditioning market has developed significantly, and today it is possible to choose a solution suitable for most apartments — provided that both catalogue specifications and the actual conditions of the building are taken into account from the outset. It is also worth remembering that most modern air conditioners are, in practice, air-to-air heat pumps: in addition to cooling, they can also provide heating, which can be useful during transitional seasons. Interested in air-conditioning installation in Luxembourg? Read on.
In Luxembourg, you will find several types of air-conditioning systems, which differ not only in how they work, but also in their installation requirements and suitability for apartments. In most cases, the choice comes down to whether you can install an outdoor unit and how many rooms you actually want to cool.
Split Air Conditioners
A split air conditioner is the most commonly chosen solution for apartments, offering the best balance between cooling efficiency, comfort, and quiet operation. It consists of one indoor unit and one outdoor unit, which means that mainly the quiet air supply operates inside the apartment, while the louder part of the system is located outside. This usually means better efficiency than portable units, more stable temperature control, and lower running costs.
A split system works best when you want to cool one main area, such as a bedroom or a living room with an open-plan kitchen. Many models also offer a heating function, which can help during transitional periods. The downside is the need to install an outdoor unit — there must be a suitable location for it, such as a balcony, loggia, façade, or roof, and issues such as noise, aesthetics, and condensate drainage must be addressed. Approval from the building manager or homeowners’ association is also often required, especially if the installation affects the façade or common areas of the building.
Multi-Split Air Conditioners
A multi-split system is an option for those who want to cool several rooms, for example in 3- or 4-room apartments or where bedrooms are separated from the living room. The system has one outdoor unit and several indoor units, such as one in the living room and others in the bedrooms. This makes it easier to maintain comfort in different parts of the apartment and set different temperatures in individual rooms. The advantage is aesthetics — only one unit operates outside — but it is important to remember that a multi-split system is usually significantly more expensive than a single split unit. Installation requires proper planning, as refrigerant piping must reach several rooms, and the longer and more complex the routes, the more important installation quality becomes.
Power balance is also important: the outdoor unit has limited capacity, and when several indoor units operate at high settings at the same time, the system must distribute power between the rooms. For this reason, choosing a multi-split air-conditioning system should take into account not only the floor area, but also how the apartment is used — whether you cool everything at once, or mainly the living room during the day and bedrooms in the evening.
Ducted System
A ducted system is a more built-in form of air conditioning. Cool air is distributed through ducts to several rooms and supplied via discreet air grilles. It is an excellent solution, but it is best planned already at the design stage. This type of air conditioning requires a significant amount of installation space — usually a suspended ceiling or another space that allows the ducts and unit to be concealed. It works particularly well when aesthetics and even distribution of cool air are priorities.
Selecting the Right Air-Conditioner Capacity for an Apartment
Choosing air-conditioner capacity based solely on floor area is a common cause of disappointment, because the same floor area can cool very differently depending on the floor level, glazing, orientation, sun exposure, and insulation. Occupants and everyday heat sources, such as cooking and electrical appliances, also play a role. Importantly, higher capacity does not always mean a better solution: an oversized air conditioner often operates in short start/stop cycles, which reduces comfort in terms of temperature stability and perceived humidity. This type of operation can also be noisier, as frequent switching on and changes in fan speed are more noticeable. That is why air conditioning should be selected according to the apartment’s actual conditions and lifestyle, not just its surface area.
Three Typical Apartments and One Typical House — An Indicative Approach
Below is an indicative approach that can help establish a reference point when choosing an air-conditioning system. These are not rigid standards, as sun exposure, glazing, floor level, and insulation ultimately matter most, but these figures provide a good basis for discussion with an installer.
Studio / one-room apartment, 30–45 m² — usually a 2.5–3.5 kW split system will be suitable; one unit in the main room is generally sufficient if the layout is open.
Apartment, 50–70 m² — most often, a 3.5–5.0 kW split system is chosen if you mainly cool the living room, or a small multi-split system, such as living room + bedroom, if comfort in two rooms is important.
Apartment, 80–100 m² — a multi-split system with 2–3 units is often the best choice; total capacity is usually in the range of 5.0–8.0 kW, depending on the layout and sun exposure.
House, 120–160 m² — most often, a multi-split system with 3–5 units or a ducted system during a larger renovation is considered; total capacity typically falls within the range of 8.0–12 kW, although in houses the differences depend heavily on insulation and the size of glazed areas.
How Does Voltmax Help Select and Install Air Conditioning in an Apartment?
Voltmax selects air conditioning based on the specific apartment and the way you actually use it. We assess the layout of the rooms and identify where you want the greatest comfort during hot weather, for example in the living room during the day and in the bedroom in the evening. We then propose the most sensible options: split, multi-split, or — if installing an outdoor unit is difficult — alternative solutions.
At the same time, we check how to carry out the installation properly. We propose the location of the outdoor unit and the route of the installation so that it is aesthetic, safe, and problem-free in everyday use. We also take into account practical issues that most often emerge only afterwards: noise, vibrations, condensate drainage, and service access. If the building has rules regarding installation on the façade or in common areas, it is worth confirming approval in advance with the building manager or homeowners’ association. We can advise what usually needs to be prepared to make the process as smooth as possible.
Finally, we select the capacity and configuration according to the apartment’s conditions, including sun exposure, glazing, floor level, insulation, and number of rooms, in order to avoid oversizing and unnecessary start/stop operation. Interested? Contact us. We will prepare 2–3 installation proposals for your apartment, optimised in terms of both cost and installation feasibility.
