Why Proper Installation Matters
Even the best air conditioner on the market will underperform — or fail prematurely — if it's installed incorrectly. Poor positioning, incorrectly sized pipework, refrigerant leaks, and inadequate drainage are among the most common installation mistakes. Understanding the process helps you ask the right questions and ensure the job is done properly.
Do You Need a Licensed Installer?
In most countries, handling refrigerant and making electrical connections to an air conditioning unit legally requires a licensed technician. In Australia, this means a licensed refrigerant handling technician and a licensed electrician. In the UK, installers should hold an F-Gas qualification. In the US, EPA Section 608 certification is required. Never hire an unlicensed installer — it voids your warranty and creates safety risks.
Choosing the Right Location for the Indoor Unit
Where you mount the indoor (evaporator) unit has a major impact on performance. Keep these principles in mind:
- Height: Mount the unit high on the wall — cold air falls naturally, so high placement ensures even distribution.
- Airflow clearance: There should be at least 15 cm of clearance above the unit and no obstructions blocking the air outlet.
- Away from heat sources: Don't place it near lamps, televisions, or sunny windows — these can confuse the thermostat sensor.
- Central to the room: Position the unit so it can reach the whole room without obstruction from walls or furniture.
- Drainage access: The condensate drain pipe must have a natural downward slope to an appropriate drainage point.
Choosing the Right Location for the Outdoor Unit
The outdoor (condenser) unit is equally important to position well:
- Place it in a shaded or partially shaded area if possible — direct sun reduces efficiency.
- Ensure there is at least 30–50 cm of clear space around all sides for airflow.
- Do not place it in an enclosed or poorly ventilated space (e.g. a cupboard or narrow alley).
- Avoid positioning directly under a dripping roof or near garden sprinklers.
- Mount it on a sturdy bracket or concrete pad to reduce vibration noise.
The Pipework (Line Set)
The refrigerant pipes connecting the indoor and outdoor units are called the line set. Your installer should:
- Use correctly sized copper pipe for the unit's capacity.
- Keep the pipe run as short and straight as possible to minimise efficiency loss.
- Insulate the pipes properly to prevent condensation and heat gain.
- Pressure-test and vacuum-purge the system before charging it with refrigerant.
A maximum pipe length is specified by the manufacturer — exceeding this requires additional refrigerant to be added, which must be done accurately.
Electrical Requirements
Most residential split systems require a dedicated circuit from your switchboard. Your installer or electrician should confirm:
- The correct breaker/fuse size for the unit's amperage draw.
- That the cable gauge is appropriate for the circuit length and load.
- That an isolator switch is installed near the outdoor unit (required in many regions).
What Happens on Installation Day
A typical split system installation takes between 2 and 4 hours for a standard single-room unit. The process includes: mounting both units, drilling penetration holes, running and insulating the line set, making electrical connections, and testing the system with a full operational check. Ask your installer to walk you through the remote control functions and recommended temperature settings before they leave.
After Installation: First-Use Tips
- Run the system for a full cycle and check for any unusual noises or odours.
- Verify the condensate drain is flowing correctly — pour a small amount of water into the drain pan tray if you're unsure.
- Register your warranty immediately — most manufacturers require this within 30 days of installation.
- Schedule your first service for 12 months after installation.