A monoblock air conditioner is an all-in-one air conditioner in which all components are integrated into a single unit, whereas a split air conditioner consists of an indoor unit and an outdoor unit connected by refrigerant lines. The main difference lies in the installation: a monoblock air conditioner only requires holes in the wall for air intake and exhaust, while a split system requires more complex piping between the indoor and outdoor units.

Why do wrong choices with air conditioners lead to higher energy costs?

Many people choose an air conditioner without fully understanding which type best suits their situation, resulting in energy waste and higher monthly costs. A system that is too large runs on and off constantly, while one that is too small has to work overtime to reach the desired temperature. This inefficiency can increase your energy bill by 30 to 50 percent compared to a well-matched choice.

By analyzing the room size, insulation quality, and usage pattern in advance, you can choose the right type and capacity. This not only prevents unnecessary energy costs but also ensures optimal comfort in your home.

How does incorrect installation affect the lifespan of your air conditioner?

A poorly installed air conditioner can last up to 40 percent shorter than expected, primarily due to issues with air circulation, moisture drainage, and mounting. Incorrectly drilled holes lead to leaks, condensation problems, and structural damage to your home. These problems often do not manifest until months later, when repairs become expensive and complex.

Professional installation with the correct drilling techniques and finishing protects both your investment and your home. This means the use of water-cooled core drills for concrete, dust extraction for stone, and proper sealing of all penetrations.

What is a monoblock air conditioner and how does it work?

A monoblock air conditioner is a compact air conditioner in which all essential components are housed in a single casing. The system mounts to the interior wall and uses two holes in the wall for air exchange with the outside. Warm air is expelled through these holes, and cool outside air is drawn in for the condenser.

The operating principle is relatively simple: the compressor, evaporator, and condenser are all located in the indoor unit. Heat is extracted from the indoor air via a heat exchanger and discharged outside through the air ducts. Modern monoblock air conditioners can both cool and heat by reversing this process.

The installation requires two holes of approximately 16 centimeters in diameter, which are finished with steel grilles. For optimal performance, an additional hole is often drilled for condensate drainage, as the system can extract up to 15 liters of moisture per day during high humidity.

What is a split air conditioner and what are the parts?

A split air conditioner consists of two main components: an indoor unit (evaporator) and an outdoor unit (condenser/compressor). These parts are connected by refrigerant lines in which refrigerant circulates to transfer heat between the inside and the outside.

The indoor unit contains the evaporator and fan, and is usually mounted high on the wall or in the ceiling. The outdoor unit houses the compressor, condenser, and expansion valve, and is placed outside on the ground, on the facade, or on the roof.

The installation requires running refrigerant lines, electrical wiring, and a condensate drain between the two units. This is often done through a hole of approximately 6 centimeters in diameter, much smaller than with monoblock systems. The refrigerant lines must be professionally connected, and the system must be vacuumed and filled with refrigerant.

What are the main differences between monoblock and split air conditioners?

The fundamental differences between both systems determine which one best suits your situation:

Installation complexity: Monoblock only requires wall holes; split requires piping and a professional refrigerant connection.
Noise level: In a monoblock, the compressor is located indoors, while a split unit places it outside for less indoor noise.
Energy efficiency: Split systems are typically 15-20% more efficient due to better heat exchange.
Flexibility: Split air conditioners offer more options for the placement of the indoor and outdoor units.
Maintenance: A monoblock is easier to access; a split requires maintenance of both units.

For rental properties or temporary solutions, a monoblock offers more advantages due to simpler installation. For permanent installations in owner-occupied homes, a split system often performs better in the long term.

Which air conditioner is more suitable for different rooms?

The choice depends on the specific circumstances of your space and living situation:

Monoblock air conditioning is ideal for:

Rental properties where you are not allowed to make permanent changes
Spaces where no outdoor space is available for a condenser unit
Smaller spaces up to approximately 40 square meters
Situations where quick installation is desired
Homes where noise from the outdoor unit would be problematic for neighbors

Split air conditioning is more suitable for:

Large spaces exceeding 40 square meters
Permanent installations in private homes
Situations where maximum energy efficiency is a priority
Spaces where minimal indoor noise is desired
Homes with suitable outdoor space for the condenser unit

For specific situations, such as monumental buildings or homes where external vents are not possible, special solutions exist, such as water-cooled monoblock systems.

What do monoblock and split air conditioners cost to purchase and operate?

The total costs differ significantly between the two systems, both at purchase and during use.

Purchase costs of a monoblock air conditioner:

Entry-level models: €1.500 – €1.700
Mid-range models: €1.700 – €2.200
Premium models with extra features: €2.750 or higher
Total investment including installation: €2.000 – €3.000

Purchase costs of a split air conditioner:

Basic split systems start around €1.200 – €1.800
Mid-range: €1.800 – €2.500
Premium inverter models: €2.500 – €4.000
Installation is more complex and more expensive due to piping

In the long term, split systems are often more cost-effective due to their higher energy efficiency. The difference in power consumption can amount to up to 20%, which saves hundreds of euros per year with intensive use. For occasional use, this advantage does not always outweigh the higher installation costs.

How do you install a monoblock versus a split air conditioning system?

The installation procedures vary significantly in complexity and required skills.

Monoblock installation:

Determine the optimal position on the exterior wall
Drill two holes with a diameter of 16 cm through the wall.
Use water-cooled core drills for concrete, dust extraction for stone.
Install steel gratings for finishing
Mount the device with the correct mounting
Test the operation and airflow

Split system installation:

Determine positions for indoor and outdoor units
Drill a hole for cooling pipes (usually 6 cm in diameter)
Pull refrigerant lines, electrical cable, and condensate drain.
Mount both units in the correct locations
Connect cooling lines professionally
Vacuum the system and fill with refrigerant
Test all functions and check for leaks.

Split installation requires certified professionals for refrigerant work, while monoblock installation primarily requires precision during drilling and mounting.

How De Betonboorder helps with monoblock air conditioning installation

We specialize in the professional installation of monoblock air conditioners by drilling the necessary holes in all types of walls. Our experience ensures a perfect installation without damage to your home.

What we do for you:

Professional drilling of two 16 cm diameter holes in concrete or stone
Use of water-cooled core drills for concrete and dust extraction for stone walls
Protection of walls and floors during drilling
Finished with steel grilles for a neat appearance.
Optional drilling of condensate drain at no extra cost
Installation possible on any floor, workspace is left tidy

Thanks to our nationwide network of experienced professionals, we can arrange a tradesperson within two days. Contact us Contact us for a no-obligation quote for your monoblock air conditioning installation.

What is the difference between a monoblock and a split air conditioner?