DIY air conditioning installation: the €200 you don't actually save

Installing air conditioning yourself: the fine print behind the 200 euros

Saving the 200-euro installation fee by fitting your own air conditioner is possible, but the saving comes with fine print. The video that opens the topic claims the job is simple and that trinc a few steps is enough; the technical response comes back fast and sharp: the system does not purge itself, and the air left inside the circuit reacts with moisture and turns into acid that ends up corroding the compressor. The damage does not show up on day one. It takes years.

What happens if you don't pull a vacuum on the circuit

The core argument of the DIY method is that the air is swept out when you open the liquid valve, because it does not mix with the refrigerant and is pushed out. The result, even the method's defenders admit, is a system running a few bars above where it should. A vacuum pump, by contrast, removes the air and the moisture and, as a bonus, helps detect leaks before the refrigerant is released. Some claim the soapy-water test is enough to find leaks; the answer is that the pump does that job with more precision and without waiting for the circuit to be charged.

The tool is not cheap, and that's where home ingenuity kicks in: a compressor salvaged from a scrapped fridge, connected to the suction line with a hose from a puncture-repair kit, does the job of a vacuum pump. It's the kind of solution that explains why the method has defenders and why professionals distrust it in equal measure.

The real price of installation and the warranty

The range the industry charges for materials is wide: some people pay 500 euros for a basic installation, while others get a 500-euro quote for three units, with the warning that the job takes a full day, not a morning. The 200-euro saving, then, depends on who you compare with.

The other cost is the warranty. An installer accredited by the manufacturer is responsible for commissioning; a self-install does not cover loss of refrigerant charge, and no warranty covers a botched installation. The flaring tool, used to shape the ends of the pipes, also costs money and is not easy to borrow.

Installer training called into question

Things heat up when the trade's qualifications come up. It is claimed that many installers don't know why things are done, they just repeat what they were taught on the course, and the focus falls on the authorised installer licences obtained with minimal training. The accusation is harsh and unnamed, but it explains the mood: if the technician doesn't pull a vacuum, why pay him?

Against that, the case for DIY rests on experience: three units installed six years ago and later replaced with inverter systems, two of one brand and one of another, with no notable incidents.

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The deeper question remains, the one no video can answer: how many of those DIY installations will still be working in a decade. With the data available, nobody knows.