Can you install an AC or heat pump yourself?

Short answer: you can buy the unit yourself, but installing it isn't legal without a licensed refrigeration installer. Connecting the refrigerant circuit, evacuating it, and commissioning the unit is, by law, work only a trained, registered refrigeration installer can do, not the buyer of the unit.

Installing an AC or heat pump requires both a refrigeration installation license and an electrical installation license. Nearly every private individual is missing both.

This isn't just a formality, it's a technical reality: the refrigerant circuit needs to be evacuated and charged correctly for the unit to run efficiently and safely for years. A poorly made connection shows up either immediately (the unit doesn't work) or later on (reduced performance, a refrigerant leak, premature failure).

Why refrigeration work isn't a DIY job

Refrigerant piping runs between an AC or heat pump's indoor and outdoor units, and it needs to be connected, evacuated, and pressure-tested before commissioning. This work requires a refrigerant handling qualification under the EU's F-gas regulation, which is granted through training and a demonstrated exam, not included in the box with the unit. A connection made without it breaks the regulations regardless of whether the unit appears to work.

Coolflat is a refrigeration business registered with Tukes (Tukes ID TP111287, class E3 authorization), and every installation we do is carried out by our own trained staff holding that license, not random subcontractors.

Electrical wiring is its own license

Besides the refrigeration work, the unit often needs to be wired into the property's electrical system. That is electrical work under electrical safety law, which only someone with electrical installation rights is allowed to do. The combination is strict on purpose: incorrect refrigeration or electrical work can cause both device damage and a real fire safety risk.

Don't forget the housing company's permission

A self-installation also often skips the renovation notice a housing company requires. Under a Finnish Supreme Court ruling (KKO 2021:32), a shareholder has the right to install an AC or heat pump on their balcony, but the housing company has the right to set conditions on the installation in advance.Read more about permits and conditions in this article.An installation done without a notice can end with the housing company requiring the unit to be removed afterward.

What happens to the warranty and insurance

The manufacturer's device warranty almost always requires the installation to have been done by a qualified professional, following the instructions. A self-installed unit is therefore unlikely to have a valid warranty in a fault situation. The same goes for home insurance: if a self-installation causes, say, water damage, the insurer can refuse to pay out, since the work wasn't done according to regulations.

With a professional installation, on top of the manufacturer's device warranty, you also get a separate installation warranty for the work itself, covering things like mounting, piping, or electrical errors.

What you can do yourself in the process

While the actual refrigeration and electrical work isn't a DIY job, you can very much be involved in parts of the process:

• Thinking through the installation spot and its suitability beforehand
• Dealing with the housing company and filing the renovation notice
• Choosing the model and capacity that fits your home
• Basic maintenance after installation, like cleaning the filters

Doing basic maintenance yourself after installation is a different thing from installing the unit yourself.Read what maintenance you can do yourself and what's left to a professional.