An air conditioner in the attic costs on average between 1.000 and 2.500 euros, including installation, depending on the type of system, cooling capacity, and complexity of the installation. Attics often require a more powerful unit than other rooms because heat rises and the space warms up quickly. In this article, we answer the most frequently asked questions regarding costs, choices, and practical considerations.

What factors determine the price of an air conditioner in the attic?

The price of an air conditioner in the attic is determined by the type of system, the required cooling capacity, the accessibility of the space, and the complexity of the installation. Attics are generally warmer and less well insulated than other floors, which directly affects the choice and, consequently, the costs.

The most important factors at a glance:

Air conditioner type: A split-unit, multi-split, or portable air conditioner differs significantly in purchase price and installation costs.
Cooling capacity: A larger attic requires more power, which increases the price of the unit.
Insulation: A poorly insulated attic requires a more powerful air conditioner, which drives up costs.
Opening hours office Narrow stairwells or hard-to-reach exterior walls make installation more time-consuming.
Pipe length: The further the outdoor unit is from the indoor unit, the more copper and insulation material is required.
Penetration through wall or roof: Making a through-hole requires specific tools and craftsmanship

Also take into account additional costs, such as electrical modifications, if the fuse box is not suitable for the extra load of an air conditioning system.

What are the average costs for installing air conditioning in the attic?

The average installation costs for an air conditioner in the attic range between 400 and 900 euros, excluding the unit itself. A complete split unit, including installation, therefore quickly comes to 1.200 to 2.500 euros. For a multi-split system with multiple indoor units, the total costs are higher.

For reference:

Mobile air conditioner: 300 to 700 euros purchase, no installation costs but less effective
Fixed split-unit (indoor unit + outdoor unit): 800 to 1.800 euros for the unit, plus 400 to 900 euros for installation
Multi-split system: from 2.000 euros for the equipment, installation costs depending on the number of indoor units

Would you like a quick indication of the costs for your specific situation? Via the pricing tool You will receive a targeted price indication based on your wishes.

How are cooling capacity and power calculated for an attic?

The cooling capacity for an attic is calculated based on the volume of the space, the quality of insulation, the amount of sunlight, and the presence of skylights or sloping walls. As a rule of thumb, approximately 80 to 100 watts of cooling capacity per cubic meter applies to a well-insulated space, but for attics, this is often higher.

Attics are particularly sensitive to heat for a number of reasons:

Warm air rises and collects on the top floor
A flat or pitched roof absorbs direct sunlight and releases heat into the space below.
Skylights significantly intensify the greenhouse effect.
Insulation in attics is often thinner or of lower quality than on other floors.

Always have an installer perform a calculation based on your specific situation. A unit that is too small cools insufficiently, while a unit that is too large switches on and off too quickly, which shortens the lifespan and increases energy consumption. Via the air conditioning selection guide Quickly find the right capacity for your attic.

What is the difference between a fixed air conditioner and a portable air conditioner for the attic?

A fixed split-unit cools more effectively, operates more quietly, and is more energy-efficient than a portable air conditioner. A portable air conditioner requires no installation but is less powerful, noisier, and blows warm air outside through a hose, which causes problems in attics without windows or roof hatches.

Fixed split-unit in the attic

A fixed air conditioner consists of an indoor unit and an outdoor unit, connected by pipes through a penetration hole in the wall or roof. The advantages are clear: high efficiency, low noise level, and a longer lifespan. Moreover, a split-unit can also heat in the winter, making it a versatile investment. The disadvantage is the higher purchase and installation price and the need for drilling.

Portable air conditioner in the attic

A portable air conditioner does not require a permanent installation and can therefore be deployed quickly. However, there are disadvantages: the exhaust hose for warm air must be routed outside, which must be done via a skylight or hatch. This is difficult to solve in attics without an opening. Moreover, portable units are less energy-efficient and cool a room less evenly. For temporary use or as an interim solution, a portable air conditioner may suffice, but for a permanent solution, a fixed unit is almost always the better choice.

Do you need to drill a hole in the wall or roof to install air conditioning in the attic?

Yes, for the installation of a fixed split air conditioner in the attic, a pass-through hole must always be made. This hole, typically 60 to 80 millimeters in diameter, is required for the copper pipes, the electrical cable, and the condensate drain that connect the indoor and outdoor units.

In an attic, there are two common options for cable routing:

Through the facade or parapet: If the attic has a vertical wall, this is the most common and simplest option.
Through the roof or roof boarding: For a fully pitched roof without vertical wall sections, a roof penetration is necessary, which is technically more complex.

Drilling such a hole in concrete, stone, or roof sheathing requires precise work to prevent damage to the structure and water infiltration. Precision is essential here, both for watertightness and for the stability of the structure. View the full range of services on the website of De Betonboorder for more information about through-hole drilling.

When is an air conditioner in the attic not the best choice?

An air conditioner in the attic is not always the most effective solution. If the attic is extremely poorly insulated, even a powerful air conditioner operates inefficiently and energy costs are high. In that case, it is wiser to invest in better roof insulation first before installing an air conditioning system.

Other situations where an air conditioner in the attic is less suitable:

The attic is only used occasionally, making it difficult to recoup the investment.
There is no suitable location for the outdoor unit, for example due to a lack of load-bearing ground or neighbors who object.
The electrical installation is outdated and cannot handle the extra load without costly modifications.
The attic has poor air circulation, causing cooling to be distributed unevenly.

In such cases, alternatives such as a fan, a ventilation system, or roof insulation may be a better first step. Always seek advice from a certified installer before making a decision.

How De Betonboorder helps with air conditioning installation in the attic

For the installation of a fixed air conditioner in the attic, a through-hole is indispensable. This is exactly where we make the difference. De Betonboorder takes care of the professional drilling of through-holes in concrete, stone, roof decking, and other materials, so that your installer can get to work immediately.

What we arrange for you:

Accurate drilling of through holes with the correct diameter (typically 60 to 80 mm)
Drilling in concrete, brick, aerated concrete and other construction materials
Working in hard-to-reach places such as a sloping roof or a high facade
Tidy handover: the workplace is left clean and tidy.
Rapid deployment: in many cases, a professional on site within two working days

Ready to prepare your attic air conditioning installation? Contact us and we will contact you within 24 hours.

How much does an air conditioner in the attic cost, including installation?