Greater London · Air handling unit cleaning
Harmondsworth AHU cleaning
Air handling unit cleaning in Harmondsworth, surveyed first and signed off with a written report and pictures. Call for a fixed quote.
- Air handling units never cleaned inside
- Odours coming through the supply air
- Debris and leaves in the fresh air intake
Harmondsworth buildings and their air
There are about 11 schools, colleges and universities, about 7 caring premises (care homes, nurseries and hospitals) and about 12 hotels and B&Bs on the FSA’s food hygiene register within 1.5 miles or so of the middle of Harmondsworth. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. The nearest hospital to Harmondsworth is Harlington, about 1.4 miles east. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital. In London, ventilation plant is often on the roof or below ground, so the work is usually done out of hours.
Wherever a school like Harmondsworth Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Harmondsworth is about 1 mile south-west of West Drayton, in Greater London. Whether your site is in the middle of Harmondsworth or further out, we cover AHU cleaning for every kind of premises, from a single unit to a large public building. Harmondsworth is one of 764 places in Greater London we cover for AHU cleaning. London is in our area too, about 17 miles from Harmondsworth.
All of UB7 and TW6 is within our area for AHU cleaning, from busy streets to back roads. That includes premises on Moor Lane, Hatch Lane and High Street and nearby roads. If your site is just outside Harmondsworth, we cover Longford (1 mile south-west), Sipson (1 mile north-east), Heathrow (2 miles south-east), Harlington (2 miles east) and Stanwell (2 miles south). We also work in nearby towns such as City of Westminster (14 miles east), Marylebone (14 miles east), Kensington (12 miles east), Hampstead (14 miles east), Ruislip (7 miles north-east) and Brompton (14 miles east).
Around Harmondsworth
Locally, jobs take us to businesses close to Harlington Community School and The Five Bells Inn, among other places. The closest station to Harmondsworth is Heathrow Terminal 5 Rail station, roughly 1 mile south of the centre. Well-known places in the area include British Airways Heritage Collection (3.5 miles north) and Harlington (1.4 miles east). The countryside around Harmondsworth includes Crane Meadows and Staines Reservoirs.
AHU cleaning in Harmondsworth
An AHU clean is a thorough examination and treatment of the unit. Every section is opened, cleaned and photographed, so you can see the unit’s condition for yourself. The work covers drain trays, dampers and louvres and filter sections, and people most often call us about debris and leaves in the fresh air intake and blocked condensate drains and slimy trays.
In London, plant rooms are often in basements or on roofs reached through occupied floors, so work in Harmondsworth is often done in the evening or at weekends. Loading and parking are planned with the building first.
Each visit ends with a written report and pictures, so there’s a dated record of the work. Where the work is a TR19® Grease clean, the certificate is issued through the BESCA Vent Hygiene Elite portal.
- Place
- Harmondsworth (UB7, TW6)
- Region
- Greater London
- Records
- Written report with pictures
- Price
- A fixed price before we start
- When we work
- After hours by arrangement; emergencies any time
- Call
- 0345 646 2711
- Reviewed
- 30 October 2026
What happens on the day
At the end of the visit, someone from your team can look over the work with us. We point out anything that couldn’t be reached or needs a follow-up, and it goes on the report too. All told, the work takes anything from half a day for one small unit to several shifts for a plant room full of them. Expect the work in Harmondsworth to happen after your last customer leaves, not during trading.
- First the unit is surveyed, from pictures or a visit, and the scope agreed.
- With your site team, the unit is switched off and isolated, then the area around it protected.
- Filters are dealt with as agreed, and the coils, fan and casing cleaned.
- Standing water and slime come out of the tray and the drain is checked.
- A TR19® certificate and photo report follow the clean.
Before we arrive
- Arrange a key holder or contact on site
- Move anything stored near the system
- Let us know about parking and loading
How to get a quote
Quotes are quick. Call or email with a few details and you will normally have a fixed price within one working day. If we need to see the system first, we book a survey around your hours.
Related advice
Nearby places to Harmondsworth
Also in Harmondsworth
Your questions about AHU cleaning in Harmondsworth
What do you need to know about parking in Harmondsworth?
Tell us where a van can stop near your site in Harmondsworth, and about any building rules on loading. Much of our London work is done overnight, which helps.
Do you do school ventilation cleaning in Harmondsworth in the summer holidays?
Yes, and it’s the easiest time to do it. Food Standards Agency records list about 11 schools, colleges and universities with registered kitchens within about a mile and a half of Harmondsworth. You can call 0345 646 2711 or use the quote form with the dates the site is empty.
What is TR19?
TR19® is the BESA specification for keeping ventilation systems clean. Since 2019, TR19® Grease has been a standalone specification for grease in kitchen extract systems, while TR19® Air covers other supply and extract ductwork.
Is Harmondsworth in your area?
Yes. Harmondsworth is part of the area we cover, within the South East and London area we cover.
How often should an air handling unit be cleaned?
It depends on the unit, the filters and how the building is used. Inspection tells you when cleaning is needed, and we’ll suggest an interval after the first clean.
How far ahead should we book?
Book as early as you can for planned work, particularly if your next visit is nearly due. For emergencies, we take calls 24/7.
Is a quote from photos possible?
Yes, if we can see what we need. If not, a site survey comes first, then a fixed quote.
Can you fix a faulty AHU?
We clean the unit and flag faults rather than repair them, with photos where it helps.
What we’re called out for in Harmondsworth
Planned maintenance often covers belts, motors and filters but not cleaning. So a unit can be well maintained and still dirty.
Keep an eye out for any of the following:
- Rooms that smell stuffy when the system runs
- Dirty filters cutting the airflow
- Fan sections that haven’t been cleaned in years
- Intake sections clogged with outdoor debris
Healthcare buildings such as Harlington, about 1.4 miles east, depend on their ventilation; if you manage a surgery, clinic or care home near Harmondsworth, yours matters too.
Questions to ask before you book
- If the quote is a fixed price or an estimate
- Whether a written report and pictures are included
- What happens if part of the system can’t be accessed
- Which accreditations they hold, and whether you can check them
What happens if it’s left?
Cleaning a unit while it only has light dust is quick. Leave it for years and dirt bakes onto coils and casings, particularly where damp has made it stick. Leaving it on a busy London site only adds to the work.
What you pay reflects the actual work. That’s why we survey first, from photos or on site, and why the quote is fixed before work begins.
What you get with us
- Full insurance on every job
- One contact for all your sites in London and the South East
- Each visit written up, with photos
- Evenings, overnight and weekends, plus 24/7 emergency callout
Read how cleaning jobs are priced and how to check a contractor.
Multi-site and managed buildings
Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must assess and reduce fire risk, which may be the employer, owner, landlord, FM or managing agent. Where responsibility is shared, records matter even more.
Records are where multi-site compliance often slips. Each visit ends with a dated report and pictures, so you can show an insurer or inspector what was done at each site.
What staff can safely do
If your staff spot something between visits, such as dripping grease, a noisy fan, a smell or a filter that won’t come clean, they should report it rather than try to fix it. We can diagnose it and quote.
Good housekeeping makes our visits easier, not unnecessary. Regular in-house cleaning slows the build-up, but hidden parts of the system still need specialist attention.
How the job changes from site to site
Rooftop and plant room units
Units outside are exposed to weather and windblown debris. We clean the intake and first stage of filters along with the rest.
Heating and cooling coils
Dirt on a coil slows the air and makes it harder for the coil to heat or cool. A clean gets air moving through the coil properly again.
Keeping the system healthy
How long the results last depends on use and care. We suggest:
- Clear leaves and litter away from the intake
- Don’t ignore odours coming through the grilles
- Store the TR19 paperwork where auditors can find it
- Make sure the unit’s access doors open easily
Stick to the filter change schedule, because good filters protect everything downstream. Record each change in the maintenance log.
Change or clean filters on time. Once filters clog, dirt starts getting past them.