Greater London · Air handling unit cleaning
Air handling unit cleaning in Old Coulsdon, Greater London
AHU cleaning across Old Coulsdon and nearby, timed so the site keeps working and finished with a written report and photos.
- Filters that are clogged or overdue
- Fan sections that haven’t been cleaned in years
- Rooms that smell stuffy when the system runs
AHU cleaning in Old Coulsdon, done properly
The fan pushes every bit of air in the system, so dirt on the impeller and housing gets spread around. We clean the fan section along with the rest of the unit, with the unit switched off and made safe first. The work covers internal panels, heating and cooling coils and filter sections, and people most often call us about plant that has been serviced but not cleaned and blocked condensate drains and slimy trays.
Across London, offices, hotels, schools and healthcare buildings rely on mechanical ventilation, much of it supplied through air handling units on roofs or in basements. In a building in Old Coulsdon, dust and debris build up in the units and ductwork over time, which is what TR19® Air cleaning deals with.
Duct Doctor has been trading since 2009, as a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. CHAS, SafeContractor and ISO 9001 are in place too, and we’re fully insured.
- Place
- Old Coulsdon (CR5, CR3, CR8)
- Region
- Greater London
- Records
- Report and photos after the visit
- Quote
- A fixed price before we start
- Hours
- Nights, weekends or holidays to suit you
- Call
- 0345 646 2711
- Last updated
- 30 October 2026
Staff cleaning versus specialist work
Day-to-day cleaning is something your team can do: wiping down canopy surfaces, cleaning filters and keeping a simple log. What they can’t safely do is clean inside the ductwork, the fan or the risers, and that’s where we come in.
When your team notices a problem between visits, like drips, unusual noise, smells or damaged filters, it’s best reported rather than tackled in-house. We will take a look and give you a fixed quote.
AHU cleaning around Old Coulsdon
Food Standards Agency data includes about 15 schools, colleges and universities and about 27 caring premises (care homes, nurseries and hospitals) across Old Coulsdon and its immediate surroundings (about a mile and a half). Classrooms, bedrooms and care spaces are often served by ducted air, and that ductwork collects dust over time. London plant rooms are often on roofs or in basements reached through occupied floors. St Lawrence's Hospital is the nearest hospital, about 1.3 miles south-east of Old Coulsdon. Healthcare buildings depend on clean supply and extract ventilation, and the same applies to surgeries, clinics and care homes.
Wherever a school like Keston Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Old Coulsdon is about 1 mile south-east of Coulsdon, in Greater London. Anywhere in CR5, we cover AHU cleaning for commercial sites. Our area takes in 764 places across Greater London, large and small. There’s also a page for London, roughly 14 miles from Old Coulsdon.
Work in CR5, CR3 and CR8 follows the same survey, fixed quote and written report as everywhere else we cover. That includes premises on Ellis Road, Tollers Lane and Court Avenue and the roads around them. Close by, we work in Coulsdon (1 mile north-west), Chipstead (2 miles west), Purley (2 miles north), Woodcote (2 miles north-west) and Woodmansterne (3 miles west). Larger places within reach include London (14 miles north), City of Westminster (15 miles north), Marylebone (15 miles north), Kensington (14 miles north), Whitechapel (15 miles north) and Brompton (14 miles north).
What’s near Old Coulsdon
Around Old Coulsdon, our work takes us to kitchens and buildings near Sunnydown School, Dollypers Hill and The Tudor Rose pub and the streets around them. Old Coulsdon’s nearest station is Coulsdon South station, roughly 1.4 miles north-west. Well-known places in the area include East Surrey Museum (2 miles south-east) and St Lawrence's Hospital (1.3 miles south-east). Open spaces near Old Coulsdon include Nore Hill and Mercers Lake.
Leave it or put it right?
A slimy drain tray only gets worse. Left alone, it can overflow, leak into the plant area or ceiling below and spread smells through the system. Dealing with it early keeps the clean straightforward. Shared walls, risers and roofs mean a problem at one London site seldom stays put.
The cost depends on how big the system is, the condition it’s in and access to every part of it. You get a fixed price before work begins, so you know where you stand.
Why us?
- Fully insured
- A written report with pictures after every visit
- Work around your opening hours, with 24/7 emergency cover
- Trading since 2009
What affects the quote in Old Coulsdon
Your quote is based on your site. We consider:
- How easy every part is to reach
- Site rules, permits and inductions
- The number of sites or systems
- The times the site is available
One small site or a whole estate, we price it on the same basis: what needs doing, how we get to it and when. You’ll have a fixed price before we start.
Helping us quote
The more you tell us, the more accurate the quote. With your enquiry, please include:
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- Your opening hours and when the area is out of use
- Wide photos of the system and the area around it
- Any symptoms, from odd noises to smells or leaks
Want a quote for AHU cleaning? Please give us a ring on 0345 646 2711 or use the quote form with a few details about the site. We will explain what we’d do and send a fixed quote before anything is booked.
What AHU cleaning can’t fix
AHU cleaning can’t fix everything, and we’d rather say so up front. It doesn’t solve:
- Damaged coils beyond cleaning
- Mechanical faults with motors, belts or bearings
- Problems with the unit’s controls or sensors
If you’re not sure, just call us on 0345 646 2711, or send details by email and we will give you a straight answer.
Parts of the system we cover
- Dampers and louvres
- Supply and extract fans
- Drain trays
- Heating and cooling coils
- Filter sections
- Internal panels
Do you need AHU cleaning in Old Coulsdon?
Wherever there’s a cooling coil, there’s condensate. A blocked outlet or a badly sloped tray leaves standing water, and that’s where slime and odours start.
The symptoms we’re asked about most include:
- Rooms that smell stuffy when the system runs
- Leaves and litter drawn into the unit
- Plant that has been serviced but not cleaned
- Air handling units due a clean after building work
Healthcare ventilation, from large hospitals like St Lawrence's Hospital (about 1.3 miles south-east) to small clinics, depends on clean filters, coils and ducts.
Questions to ask before you book
- Whether the quote is based on a survey or pictures
- Whether the quote shows VAT
- What hours they’ll be on site
- What paperwork you get at the end
Nearby places to Old Coulsdon
Other services in Old Coulsdon
What the work involves, part by part
Internal casing and panels
The inside walls and floor of the casing collect dust and debris. Each section is cleaned from the intake through to the outlet.
Heating and cooling coils
Coil fins are close together and catch the dust the filters miss. We clean them with care so the fins are not damaged.
How the visit works
The first job on site is protection: sheeting goes over floors and surfaces close to the work. After that, the system is made safe and the work begins. It takes a single shift for a typical unit, longer for large or heavily soiled ones, and the area is cleaned down before we leave. Before any visit in Old Coulsdon, we agree where the van can stop and how equipment reaches the system.
- We start with a survey of the unit and a fixed quote for the work.
- 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.
- Drain trays are cleared and cleaned and the outlet checked.
- A TR19® certificate and photo report follow the clean.
Getting ready for the visit
- Tell us about site rules, permits or sign-in
- Mention any locked doors, roof access or ceiling voids
- Clear loose items from the work area
Get a fixed quote
Photos are enough for some jobs, while others need a look on site. Larger sites, and anything hidden behind walls, ceilings or floors, are normally surveyed first. Either way, you get a fixed price before work begins.
Advice
Old Coulsdon questions
Does London parking affect a job in Old Coulsdon?
London parking can be tight, so details of loading bays and permits help. Night visits tend to make loading easier on London streets.
Can a school’s ventilation in Old Coulsdon be done out of term time?
Yes, out-of-term visits are normal for schools. The FSA’s register shows about 15 schools and colleges with food registrations within roughly a mile and a half of Old Coulsdon. Booking early in the term gives the best choice of holiday dates.
Do you look at the system first?
Yes, always. Diagnosis comes before treatment: the survey shows what needs doing and what access we need and the fixed quote is built on it.
Do you offer maintenance contracts?
Yes. Send details of the systems and how they’re used and we’ll propose a schedule with a fixed quote.
When should our AHU next be cleaned?
It depends on the unit, the filters and how the building is used. Inspection tells you when cleaning is needed, and we will suggest an interval after the first clean.
How far ahead should we book?
For planned work, earlier is better, especially if the next clean or test is due soon. Emergencies are different, because our line is open 24/7.
Which parts of an air handling unit do you clean?
Every section that collects dirt: filters, coils, tray, fan and panels. The survey confirms what’s in your unit before we quote.
Do you work with multi-site operators?
Yes. Send the list of sites and the work at each and you’ll get one fixed quote.