A sealed, ready-to-connect split system for one room. Quicker to fit, cools and heats, and needs no F-Gas engineer.
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Standard or pre-charged systems
A pre-charged air conditioner is a split system whose outdoor unit leaves the factory sealed with a non-fluorinated refrigerant inside, with a pre-flared pipe kit to connect it. Because no fluorinated refrigerant is handled, a typical install does not need an F-Gas engineer. It still needs a qualified electrician, serves one room per outdoor unit and has a limited pipe run.
The outdoor unit leaves the factory sealed, with its refrigerant already inside.
It uses a non-fluorinated refrigerant, so the F-Gas rules that require a certified engineer for most systems do not apply to a typical install.
The pipe kit arrives pre-flared, ready to connect the indoor and outdoor units.
Once the units are fixed and the pipes connected, the valves are opened following the installation manual and the system is ready to wire in and test.
A qualified electrician connects it to a dedicated circuit.
Pre-charged systems use a flammable refrigerant. That is safe in a correctly installed sealed system, but it is one reason manufacturers set rules on room size and siting. Follow the installation manual or use an installer who knows these units.
| Standard installed | Pre-charged | |
|---|---|---|
| F-Gas engineer needed | Yes | No, for a typical install |
| Electrician needed | Yes | Yes |
| Rooms per outdoor unit | One or several | One |
| Pipe run | Longer runs possible | Limited to the supplied kit unless a technician extends it |
| Indoor unit styles | Wall, floor, cassette, ducted | Mostly wall-mounted |
| Cooling and heating | Yes | Yes |
| Best for | Whole homes, larger rooms, businesses | One room where the outdoor unit can sit close by |
Quicker to installNo vacuum pump or refrigerant charging for a standard install, so fewer specialist steps.
Fewer tradesAn electrician, or an installer who fits these units, can usually do the whole job.
Cools and heatsLike any split system, it works as an air-to-air heat pump in winter.
One room per unitNo multi-split option, so several rooms means several outdoor units.
Limited pipe runThe outdoor unit needs to sit close to the room.
Fewer sizes and stylesMostly wall-mounted units in common sizes.
Home or business, how many rooms and the system type you would like.
Only installers who cover your postcode and fit your system type.
Weigh up prices, equipment and warranties, then choose, if you want to.
Not for a typical install. They use a non-fluorinated refrigerant and arrive sealed, so the F-Gas certification rules for handling fluorinated refrigerants do not apply. A qualified electrician is still needed, and any refrigerant work, such as extending the pipes, needs a qualified technician.
The electrical connection should be done by a qualified electrician, and the work involves drilling an outside wall and fixing a heavy outdoor unit. Most people use an installer, which is what we help you find.
No. Each outdoor unit serves one indoor unit. For several rooms you would need several systems, or a standard multi-split.
Extending the pipework beyond the supplied kit means adding refrigerant, which needs a qualified technician. If the outdoor unit must be far from the room, a standard system is often the better choice.
Yes. They are air-to-air heat pumps like other split systems.
Yes, when installed to the manufacturer's instructions. The refrigerant is flammable, which is why there are rules on room size and siting.
Not normally. The refrigerant stays in the sealed system. Topping up is only needed after a leak or if the pipes were extended.
Enter your postcode and choose the pre-charged option. Installers who fit these systems in your area then send their quotes.
General information only, not technical, legal or planning advice. Installers confirm system size, siting and any permissions for your property. Updated October 2026.
Sources: The Fluorinated Greenhouse Gases Regulations (GB) and GOV.UK guidance on F-gas; Approved Document P (electrical safety) and the Building Regulations for England and Wales; the Energy Performance of Buildings Regulations (air conditioning inspections); manufacturer installation guidance for split systems.