What air conditioning installation involves
Installing air conditioning means fitting the indoor unit (or units), the outdoor unit, the refrigerant pipework and condensate drain that connect them, and the electrical supply — then commissioning the system so it runs correctly. A simple single-room job is often done in a day; larger, multi-room and concealed systems take longer and are far easier to fit during a build or refurbishment.
What gets installed
- Indoor unit(s) — on a wall, at floor level, or recessed into a ceiling.
- Outdoor unit — the condenser, sited outside.
- Refrigerant pipework — insulated pipes linking the indoor and outdoor units.
- Condensate drain — to carry away the water the unit removes from the air.
- Electrical supply and controls — power and the controller(s).
The typical steps
- Survey and design — confirm the system, sizes and unit positions.
- Indoor unit(s) — mounted and secured in the agreed positions.
- Outdoor unit — positioned on a wall bracket, ground stand or roof.
- Pipework and drainage — refrigerant pipes and the condensate drain are run between the units and insulated.
- Electrical connection — the system is wired in and the controls fitted.
- Commissioning — the pipework is pressure-tested and evacuated, the system is charged with refrigerant, and everything is tested before handover.
That last step matters more than it sounds — proper evacuation, charging and commissioning are what make a system reliable and efficient, and it’s where cutting corners causes problems later.
What affects the job
- Unit positions — where the indoor and outdoor units go, and how far apart they are; shorter, simpler pipe runs are better.
- Drainage route — condensate needs somewhere to drain to.
- Access and making good — running pipes through walls and ceilings, and tidying up afterwards.
- The outdoor unit’s location — siting affects noise, neighbours and whether planning permission is needed.
- Scale — a single split is quick; multi-split, ducted and commercial systems involve more pipework, more units and more time.
Who should do it, and how long: air conditioning must be installed by qualified engineers — and because the work involves refrigerant, it requires F-gas certified engineers. Timescales vary: a domestic single-split is often a day or so, while larger and concealed systems take longer and are best designed in during a build or major refurbishment. For outdoor units, check planning permission and think about siting and neighbours early.
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