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Cooling

Air conditioning maintenance in London

Skip servicing altogether and a system works harder than it should to do the same job, costs more to run, and fails sooner than it needs to. An annual visit from Ninja Plumbers covers the filters, the coils, the drainage, the electrics and the refrigerant pressures, plus the F-Gas leak check that the law requires on larger systems — carried out, as it must be, by F-Gas registered engineers.

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  • F-Gas certified for refrigerant work
  • Fully insured, DBS-checked engineers
  • Price agreed before work starts
  • Workmanship guaranteed

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What we cover

What this includes

  • Filters cleaned or replaced
  • Indoor coil, fan and drip tray cleaned
  • Condensate drain checked and cleared
  • Refrigerant charge and pressures checked
  • F-Gas leak checks, where required by law
  • Electrical connections and controls checked
  • Outdoor condenser cleaned and inspected
  • More frequent visits for shops, offices and heavy-use systems
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Before you call

Worth knowing first

A little of this might mean you do not need to call us at all — we would still rather you knew it.

F-Gas leak checks are a legal requirement, not an upsell

Systems holding more than a set amount of refrigerant must have regular leak checks under the F-Gas regulations. It is not something we invented to sell a service plan — it is the law, and only F-Gas registered engineers can carry it out.

Whether the leak-check rules cover your system

The threshold depends on how much refrigerant a system holds and how strong a greenhouse gas that refrigerant is, so there is no simple answer based on the size of the room. Many single-room home systems fall below it. Larger multi-splits and bigger commercial systems often do not, and the larger the system, the more often it must be checked. The legal duty, including keeping a record of each check, sits with whoever operates the system — usually the business, landlord or building owner. We will tell you where yours stands.

A dirty filter is a common reason for weak cooling

A filter that has quietly clogged up with dust forces the whole system to work harder for a worse result. It is one of the most common things a maintenance visit catches, and the easiest to put right. Often it is the whole explanation when a system that used to cool a room properly no longer seems to manage it.

The filters are the part you can do yourself

On most wall-mounted units, the filters lift out from behind the front cover without tools. Switch the unit off first, rinse them in lukewarm water, let them dry fully and slide them back in. Every few weeks while the system is in regular use is typical, and the manual for your model will give the exact interval. Keep leaves and clutter away from the outdoor unit too. The coil, the fan and anything electrical are best left to an engineer.

A musty smell usually means the coil and drip tray

If the air smells damp or stale for the first few minutes after the unit starts, mould and bacteria are usually growing on the indoor coil, on the fan or in the drip tray, where water sits in the dark. Washing the filter will not reach any of that. Cleaning those parts properly is part of a maintenance visit, and it is not a job for a can of household spray pushed through the grille.

Once a year, before the weather asks anything of it

Booking maintenance in spring, before the first warm spell, means any fault gets fixed while it is inconvenient rather than while the system is needed. Booking it in the middle of a heatwave means joining everyone else who left it too late.

Busy systems need more than once a year

An office, shop or restaurant that runs its air conditioning every working day puts far more hours on it than a bedroom unit used for a few weeks each summer. Kitchens add grease, traffic adds grime to outdoor units on busy London roads, and a server or comms room often cannot afford a breakdown at all. Twice a year is common for systems like these, and more often where they run around the clock.

A service finds faults; fixing them is a separate job

A maintenance visit is a planned check and clean. When it turns up something more — a slow refrigerant leak, a fan motor starting to wear, a condensate pump near the end of its life — you are told what it is and what it would cost to put right, and nothing is done until you have agreed to it.

Questions

Common questions

How often should air conditioning be serviced?

Once a year is standard for a home system. Shops, offices and systems that run long hours usually need more frequent visits. Systems above a certain refrigerant charge also need periodic F-Gas leak checks by law, which a routine maintenance visit covers.

What does a maintenance visit actually cover?

Filters, the indoor coil and drip tray, the condensate drain, refrigerant pressures, electrical connections and controls, and the outdoor condenser — plus an F-Gas leak check where the system requires one.

Will maintenance stop my system from breaking down?

It picks up the usual suspects before they turn into a full breakdown — a clogged filter, a slow refrigerant leak, a drain that has started to block — though no amount of servicing can promise a system will never develop a fault.

Can you maintain a system installed by someone else?

Yes, including F-Gas leak checks on existing systems, whoever fitted them. If you have records from earlier visits, keep them to hand — they show how the system has been looked after.

Is it worth servicing a system that seems to be working fine?

Usually, yes. Filters and coils clog gradually, so a system can lose efficiency and use more electricity for months before anyone notices the room is not as cool as it was. A service also catches small leaks and worn parts while they are cheap to deal with. We will not put a figure on the saving, because it depends on how neglected the system was.

Do you need access to the outdoor unit?

Yes, because a good part of the work happens there. If it sits on a flat roof, a balcony or in a shared yard behind a block of flats, please arrange access with the managing agent or neighbour before the visit, so the engineer is not left looking at it from a window.

Other services

More air conditioning work we take on

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Need air conditioning maintenance in London?

Describe the problem and give us your area, and we’ll tell you the price before anyone starts work.

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