Creating an air conditioning duct through the wall is a job many homeowners face when installing a split-unit air conditioner. Drilling a hole through the wall for the cooling lines requires proper preparation and techniques to prevent damage and achieve a professional result.

Whether you tackle the job yourself or hire a professional, it is important to understand the steps involved in creating an air conditioning duct. From choosing the right tools to determining the optimal location, every aspect contributes to a successful installation.

What tools do you need for an air conditioning duct?

To create an air conditioning pass-through, you need a diamond core drill bit with a diameter of 65–80 mm, a powerful drill, a water cooling system, and protective equipment such as a dust mask and safety glasses. The exact diameter depends on the thickness of your cooling lines and the insulation.

A professional concrete drillThe setup is essential for a clean feed. In addition to the drill bit and the machine, you also need a water collection tray to catch the drilling water and prevent damage to your interior. Marking tools, such as a pencil and a spirit level, ensure a straight, professional drill.

For concrete walls, an impact drill with a power of at least 1200 watts is recommended. For brick walls, a standard drill is often sufficient, but make sure to use the correct drill bit for the material you are working with.

How do you determine the right location for the throughput?

The ideal location for an air conditioning duct is as close as possible to the outdoor unit, with a slight slope outwards for water drainage. Avoid pipes, wiring, and load-bearing structures in the wall by locating them beforehand with a detector.

Accurately measure the distance between the indoor and outdoor units. The shorter the pipes, the more efficiently your air conditioner works. A slope of approximately 1–2 degrees outwards prevents condensation from running indoors. Also, check for any electrical or water pipes running inside the wall using a pipe detector.

Also consider aesthetics and functionality. Do not place the duct too close to windows or doors, and ensure that the exterior of the duct remains easily accessible for maintenance on the cooling lines.

What is the difference between drilling in concrete and other materials?

Concrete requires diamond core drills and water cooling to prevent overheating, whereas brick walls can often be drilled with standard masonry core drills. Reinforced concrete is the most difficult to drill due to the reinforcing bars, which can damage the core drill.

When working on concrete walls, it is important to work slowly and patiently. The hard structure of concrete can cause core drills to wear down quickly if you apply too much pressure. Water cooling is essential to keep the core drill cool and minimize dust formation.

Brick walls are generally softer and easier to work with, but can be unexpectedly hard depending on the type of brick. Sand-lime brick, for example, is harder than ordinary brick. Wooden walls, in turn, require different techniques and tools, such as a hole saw.

Challenges in reinforced concrete

Reinforced concrete contains steel reinforcing bars that pose an additional challenge. If you encounter rebar while drilling, you may need to choose a different location or apply special techniques to get through the steel without damaging the drill bit.

How do you prevent damage while drilling the through-hole?

Prevent damage by inspecting the wall beforehand with a pipe detector, always using water cooling when drilling, and selecting the correct drill bit for the material. Start at a low speed and build up slowly to prevent cracking or chipping.

Protect your interior by laying down plastic sheeting or old sheets. The drilling process can produce a lot of dust and water, especially on concrete walls. Keeping a vacuum cleaner nearby helps to clean up immediately.

Pay attention to the depth of your drilling. Measure the thickness of the wall beforehand to avoid drilling too deep and causing damage on the other side. Use markings on your drill bit to maintain the correct depth.

When should you hire a professional for the through-feed?

Call in a professional for reinforced concrete, load-bearing walls, or when you are unsure about pipes in the wall. Professional help is also wise for expensive interiors or complex situations to prevent costly damage.

If you do not have the right tools or experience with drilling, a professional can save you time and money. Incorrect techniques can lead to cracks in the wall, damaged pipes, or a crooked hole that cannot be repaired.

In rental properties, permission from the landlord is often required for this type of work. In some cases, professional execution is even a requirement to maintain the warranty.

How De Betonboorder helps with air conditioning cable ducts

We specialize in the professional drilling of air conditioning ducts through all types of walls and materials. Our experienced professionals have the right diamond drill bits and equipment to work with minimal dust and without damage.

Our services for air conditioning ducts include:

Professional drilling of holes with a diameter of 65–80 mm
Dust-free operation with water cooling systems
Expertise in concrete, brick, and other building materials
Neatly finishing and tidying up the workplace
Fast scheduling within 48 hours

Avoid costly mistakes and have your air conditioning ducting professionally installed. Contact us for a no-obligation quote and professional execution of your job.

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