Greater London · Air handling unit cleaning
AHU Cleaning in Coulsdon
We cover Coulsdon for air handling unit cleaning. Fixed quotes, work around your opening hours and photo reports on every job.
- Air handling units with blocked filters
- Debris and leaves in the fresh air intake
- Dirty coils holding back the airflow
Looking after it afterwards
Here’s the after-treatment advice, short and simple:
- Flag stale or damp smells in the supply air
- Check the drain tray is emptying during routine visits
- Plan the next inspection before the last report gets filed away
- Report water on the plant room floor
We recommend when the unit should next be inspected or cleaned, taking into account how dirty it was. TR19® Air is risk-based, so the interval depends on the unit and how the building is used.
Check drain trays and condensate drains during routine maintenance. A drain that is cleared early never gets to the slime stage.
About our AHU cleaning in Coulsdon
We clean the parts of the unit where dirt and moisture gather: filters, coils, drain trays, fans and the internal panels. Every clean comes with a TR19® certificate and before and after photos in a report. We are often asked to deal with dust-coated heating and cooling coils and air handling units with blocked filters, across drain trays, dampers and louvres and internal panels.
London offices and flats often have ductwork added through successive refits, leaving sections that are hard to reach and seldom cleaned. In Coulsdon, as elsewhere, cleaning starts with an inspection of what’s there.
The sign-off is always in writing: a dated report with pictures of the work, and for TR19® Grease cleans, a certificate issued through the BESCA VHE portal. It shows what was done and what, if anything, couldn’t be reached.
- Where
- Coulsdon (CR5, CR8, CR3)
- Wider area
- Greater London
- Records
- Report and pictures after the visit
- Quote
- A fixed price before any work starts
- Hours
- After hours by arrangement; emergencies any time
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
Common problems we fix in Coulsdon
No filter stops everything. The fine dust that passes the filters lands on the coils, the fan and the internal panels, building up layer by layer.
What we’re most often called out for:
- Air handling units due a clean after building work
- Dirty fans and fan housings
- Air handling units never cleaned inside
- Odours coming through the supply air
Classrooms and halls at schools such as Smitham Primary School are easiest to work in when pupils are away.
Comparing quotes
- What’s included in the scope, part by part
- How VAT is shown on the quote
- How they set the interval to the next visit
- Whether the work can be done while the site is closed
Nearby places to Coulsdon
What else we do in Coulsdon
Different parts, different methods
Fans and fan sections
Dust on a fan impeller adds weight and wear. Cleaning keeps it running as intended.
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.
How the visit works
We start by comparing what we find with the survey or your pictures. If anything is different, we talk it through with the person on site before carrying on. After that, the work takes anything from half a day for one small unit to several shifts for a plant room full of them. Security desks and permits-to-work are routine in London, so let us know what your building in Coulsdon needs from us.
- The survey covers the unit, its access and how it can be shut down.
- The area is protected and the unit made safe.
- Dirt and debris are removed from each section.
- Coils and trays are cleaned and the condensate drain cleared.
- The unit is closed up and handed back, with a report to follow.
How to prepare
- Move anything stored near the system
- Plan for cooking equipment or plant to be off before we arrive
- Mention any locked doors, roof access or ceiling voids
How to get a quote
Quotes are quick. Call or email with a few details and you’ll normally have a fixed price within one working day. Where a survey is needed, we arrange a time that suits the site.
Related advice
Managing agents and facilities teams in Coulsdon
We regularly work with managing agents. Send the address, what’s needed and how access works and we’ll come back with a fixed quote.
Landlords, managing agents and facilities managers book us, not only the businesses that use the systems. Shared systems, like a riser serving several units, need a clear agreement on who books the work, and we can quote for the whole system.
Coulsdon: your questions answered
Can the work in Coulsdon be done at night or at weekends?
Yes, nights and weekends are routine for us. The work in Coulsdon can fit around your hours. Tell us your opening hours when you ask for a quote.
Can ventilation in schools around Coulsdon be cleaned out of term?
Yes. The holidays are the usual time for school work. The FSA’s register shows about 14 schools and colleges with food registrations within roughly a mile and a half of Coulsdon. Tell us your holiday dates and we’ll book the visit for when the site is empty.
Do you work in Coulsdon?
Yes. Our technicians work in Coulsdon, as part of our area across London and the South East.
Do you offer emergency callouts?
Yes. There’s a 24/7 emergency line, for problems that cannot wait. Call us any time and explain what’s happened.
Can you price the work without visiting?
Yes, where the pictures show enough. Otherwise, we book a survey at a time that suits the site, and the quote follows that.
Are you insured?
Yes, we’re fully insured. CHAS and SafeContractor accreditation sit alongside it, for sites that check contractor safety.
Do you work with multi-site operators?
Yes. You deal with one contact for every site in our area, and visits can be set on a regular cycle.
When should our AHU next be cleaned?
That’s set by inspection, in line with TR19® Air. A hard-working unit, or one serving a hospital or care home, may need cleaning more often.
Ventilation in Coulsdon buildings
The FSA’s food hygiene register lists about 14 schools, colleges and universities and about 42 caring premises (care homes, nurseries and hospitals) with registered kitchens or food service in and around Coulsdon, up to about a mile and a half out. 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. The nearest hospital to Coulsdon is Purley War Memorial Hospital, about 2 miles north-east. Healthcare buildings depend on clean supply and extract ventilation, and the same applies to surgeries, clinics and care homes.
For workplaces around Coulsdon South station with mechanical ventilation, cleaning can be done in the evening or at weekends. Healthcare ventilation, from large hospitals like Purley War Memorial Hospital (about 2 miles north-east) to small clinics, depends on clean filters, coils and ducts.
Coulsdon is about 13 miles south of London, in Greater London. Every kind of commercial site in Coulsdon, we can take on AHU cleaning. We can work out of hours so the site keeps running. Coulsdon is one of 764 places in Greater London where we work for commercial clients. There’s also a page for London, about 13 miles away.
We work across the CR5, CR8 and CR3 postcode area for AHU cleaning and the streets around it. We cover sites on Hadleigh Grove, Farthing Way and Dobson Close and nearby roads. You will find Coulsdon on the B276 and B2030, so it’s easy for us to get to for out-of-hours visits. Other places close to Coulsdon include Woodcote (1 mile north), Old Coulsdon (1 mile south-east), Woodmansterne (1 mile west), Chipstead (1 mile south-west) and Purley (2 miles north-east). Within a short drive, we also cover London (13 miles north), City of Westminster (14 miles north), Marylebone (14 miles north), Kensington (13 miles north), St Pancras (15 miles north) and Shoreditch (15 miles north).
Around Coulsdon
Typical jobs here are in premises near Dollypers Hill, Coulsdon Sixth Form College and The Pembroke pub and the streets around them. There’s a railway station in Coulsdon itself: Coulsdon South station. A little further out are Croydon Airport Visitor Centre (3 miles north) and Purley War Memorial Hospital (2 miles north-east). The countryside around Coulsdon includes Duppas Hill and Mercers Lake.
Staff cleaning versus specialist work
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. Inside the ducts, risers and fan is specialist work, which is where we come in.
Staff cleaning and specialist work aren’t the same thing. Wiping filters daily and washing them weekly keeps the visible parts in order, but grease that has passed the filters is out of reach. That part needs specialist access and equipment.
Why it’s worth doing now in Coulsdon
Leave an AHU uncleaned and the dirt doesn’t stay put. It moves on into the ductwork and out into the rooms, which is why the unit and the ducts are best cleaned together. In Coulsdon, a planned overnight visit is much easier than closing unexpectedly.
The price reflects the work, not guesswork. That’s why every job is surveyed first, and why the quote is fixed before any work starts.
Why book with us
- Fixed quotes, typically within one working day
- Trading since 2009
- We diagnose before we treat
- Work around your opening hours, with 24/7 emergency cover
Take a look at what affects the cost or our accreditations and certificates.