Air conditioning maintenance in London
Leave a system unserviced and it has to work harder for the same result, costs more to run and wears out sooner than it should. Each annual visit from Ninja Plumbers covers the filters, coils, drainage, electrics and refrigerant pressures. Larger systems also get the F-Gas leak check the law requires, which only F-Gas registered engineers may carry out, as ours are.
- Refrigerant work by F-Gas certified engineers
- Engineers DBS-checked and fully insured
- Price agreed before we start
- Workmanship guaranteed
Monday – Sunday, 7:00 AM – 10:00 PM · Out-of-hours emergency? Call 020 3576 5825
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Included in the job
- Filters replaced or cleaned
- Cleaning of the indoor coil, fan and drip tray
- Condensate drain tested and cleared
- Checks on refrigerant pressures and charge
- F-Gas leak checks where the law requires them
- Controls and electrical connections tested
- Outdoor condenser inspected and cleaned
- More frequent visits for shops, offices and heavy-use systems
Read this before you ring
You may find you can sort some of this yourself, without calling us. We are fine with that, and would rather you knew it.
F-Gas leak checks are the law, not an extra we sell
Under the F-Gas regulations, any system holding more than a set amount of refrigerant needs regular leak checks. We did not dream this up to sell a service plan. It is a legal duty, and only F-Gas registered engineers are allowed to 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.
Weak cooling often comes down to a dirty filter
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. When a room that used to stay cool no longer does, this is often the whole story.
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.
Book once a year, before the warm weather arrives
Book maintenance in spring, ahead of the first warm spell, and any fault is fixed while it is only an inconvenience, not while you need the cooling. Leave it until a heatwave and you join the queue of everyone else who left it 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 we often get
How often does air conditioning need servicing?
For a home system, once a year is normal. Shops, offices and systems that run for long hours usually need visits more often. Once a system holds more than a certain refrigerant charge, the law also requires periodic F-Gas leak checks, and a routine maintenance visit includes them.
What is included in a maintenance visit?
The filters, the indoor coil and drip tray, and the condensate drain; the refrigerant pressures; the controls and electrical wiring connections; and the outdoor condenser. Where the system needs one, an F-Gas leak check is included too.
Does maintenance prevent breakdowns?
It catches the usual culprits, such as a clogged filter, a drain starting to block or a slow leak of refrigerant, before they become a full breakdown. Even so, no servicing can guarantee that a system will never develop a fault.
Will you maintain a system another company fitted?
Yes, F-Gas leak checks included, whoever installed it. Keep any records from earlier visits to hand, because they show how the system has been cared for.
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 air conditioning jobs we do
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Air Conditioning Repair
Stopped cooling, leaking indoors or tripping the breaker? We track down the fault before quoting for anything.
Read about Air Conditioning Repair -
Air Conditioning Installation
Single and multi-split air conditioning, correctly sized and positioned, and installed by F-Gas registered engineers.
Read about Air Conditioning Installation -
Air Conditioning Replacement
Worn-out or failing systems replaced, including older units whose refrigerant is no longer available for top-ups.
Read about Air Conditioning Replacement
Businesses use us for air conditioning maintenance too, among them pilates studios.
Looking for air conditioning maintenance in London?
Tell us what is wrong and where you are, and you will have the price before any work begins.