Domakihub How to Install a Split Air Conditioner in Greece
A practical wall-unit installation guide for Greek apartments, holiday rentals, and hotel rooms.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Adding a split air conditioner to a Greek property — whether an Athenian apartment, an island holiday rental, or a hotel room — is one of the highest-impact upgrades you can make. Watch the video above for a clear visual walkthrough of the full process, and use the step-by-step guide below to plan and execute your own installation. This article is aimed at property owners who are coordinating with a licensed installer or handling the work themselves on a new room without existing ductwork.
Why Split Systems Are the Standard Choice in Greece
Split air conditioners — sometimes called ductless mini-splits — dominate the Greek residential and hospitality market because they require no existing duct infrastructure. A single refrigerant line-set connects an outdoor compressor unit to an indoor wall-mounted evaporator, meaning you can cool one room at a time without tearing into ceilings or floors.
Greek summers push inland temperatures above 40 °C, and coastal properties face high humidity that accelerates wear on cheaper portable units. A properly sized inverter split system handles both cooling and heating, runs quietly enough for hotel guests, and can be rated for salt-air environments — an important consideration within a kilometre of the sea.
Before You Start: Permits, Power, and Unit Sizing
In Greece, refrigerant work must be performed by a certified HVAC technician holding an F-Gas licence. The electrical connection to the outdoor unit also requires a licensed electrician. Arrange these two tradespeople before ordering equipment — attempting the refrigerant brazing yourself is both illegal and dangerous. If you are renovating a property for short-term rental, check whether your municipality requires a building permit for the exterior penetration; most straightforward single-room installs fall under a simplified notification process.
Sizing matters enormously. A 12,000 BTU (approximately 3.5 kW) unit suits a room up to around 20 m², while a 18,000 BTU unit covers roughly 30–35 m². Undersizing leads to the compressor running continuously without ever reaching setpoint, which inflates electricity bills and shortens equipment life — a common mistake in holiday rental conversions where landlords buy on price alone.
How to Install a Split Air Conditioner: 5 Key Steps
- 1
Mount the Indoor Unit Bracket and Choose the Wall Location
Select an interior wall that shares a short path to the exterior — ideally less than 5 metres of line-set run. The indoor unit should sit high on the wall (typically 15–20 cm from the ceiling) and away from direct sunlight or heat sources. Locate the studs or concrete structure behind the plaster, then attach the mounting plate using appropriate anchors. In Greek construction, walls are usually solid brick or aerated concrete block, so a hammer drill with a masonry bit is essential. Make sure the bracket is perfectly level; a tilted indoor unit causes condensate to pool and drip rather than drain correctly.
- 2
Core Through the Wall for the Line-Set and Drain
Using a core drill bit (typically 65–75 mm diameter), bore a hole through the exterior wall at a slight downward angle toward the outside — around 3° — so condensate drains away from the building and rainwater cannot enter. Thread a protective plastic conduit sleeve into the hole before running the line-set. Bundle the refrigerant lines, the condensate drain hose, and the interconnecting electrical cable together and wrap them in foam insulation tape before passing them through. On the exterior side, route the bundle down the wall inside a rigid PVC trunking channel and connect it to the outdoor unit. Trunking protects the lines from UV degradation and gives a clean finish that meets most Greek municipality aesthetic requirements.
- 3
Install the Outdoor Compressor Unit
The outdoor unit needs a solid, vibration-dampening surface — either a purpose-made wall bracket bolted into masonry or a concrete pad on the ground. Allow at least 30 cm of clearance on all sides for airflow, and keep it out of direct afternoon sun where possible to improve efficiency. In coastal areas, choose a unit with a corrosion-resistant coating on the coil and cabinet. Secure the refrigerant line-set connections with flare nuts to the service ports on the outdoor unit, but do not tighten to final torque until the licensed technician has performed a leak check with a nitrogen pressure test.
- 4
Make the Electrical Connections
Split systems require a dedicated circuit from your consumer unit (distribution board). A licensed electrician must run the correct cable gauge for your unit's amperage rating and install a dedicated MCB (miniature circuit breaker). The interconnecting cable between indoor and outdoor units is usually a sheathed multi-core cable; follow the terminal labelling printed inside both unit covers. In Greece, outdoor wiring must be in conduit or armoured cable where exposed. Do not energise the system until all refrigerant work is complete — the compressor must never run without refrigerant charge, even briefly.
- 5
Evacuate, Charge, and Commission the System
Your F-Gas licensed technician will connect a manifold gauge set and vacuum pump to the service ports, pulling the system down to at least 500 microns to remove air and moisture from the line-set. Once the vacuum holds steady for 15 minutes, the refrigerant charge (typically R-32 or R-410A in modern units) is released from the outdoor unit's pre-charged reservoir, or supplementary refrigerant is added for longer line-set runs. The technician then checks operating pressures, verifies superheat and subcooling values, and tests the condensate drain by pouring water into the indoor tray. Finally, run the system in both cooling and heating modes and confirm the remote control, timer functions, and any Wi-Fi control app are all working before handing over to the property owner.
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FAQ
- Do I need a permit to install a split air conditioner in Greece?
- For most single-room residential installs, you do not need a full building permit, but you are typically required to notify your local municipality (dimotiki enotita) of the exterior penetration and any visible outdoor unit placement. Properties in listed areas, archaeological buffer zones, or with strict HOA rules may face additional restrictions. Always check with your local planning office before drilling through an exterior wall.
- How long does a typical split A/C installation take in Greece?
- A straightforward single-room installation by an experienced team — one HVAC technician and one electrician — usually takes four to six hours from start to commissioning. Complications such as thick reinforced concrete walls, long line-set runs, or the need to reroute existing wiring can push this to a full day. Factor in an additional half-day if the electrical consumer unit needs upgrading to accommodate the new dedicated circuit.
- What refrigerant do modern split systems in Greece use, and can I top it up myself?
- New split systems sold in Greece since 2020 predominantly use R-32, a lower-global-warming-potential refrigerant that is gradually replacing the older R-410A. Both are classified as fluorinated greenhouse gases (F-gases) under EU Regulation 517/2014, which means handling, recovery, and charging must be carried out exclusively by technicians holding a valid F-Gas certification (Article 10 licence). Topping up refrigerant yourself is illegal under Greek and EU law and can void your unit's warranty.