Hertfordshire · Air handling unit cleaning
AHU Cleaning in Walsworth
AHU cleaning for Walsworth and the surrounding area: a survey, a fixed price, careful work and proper paperwork. Ask us for a fixed quote.
- Dirty coils holding back the airflow
- Condensate trays that won’t empty
- Units that have only ever had filter changes
For landlords and multi-site operators
When the building owner and the occupier are different, the lease normally sets out who maintains what. We’re happy to deal with either side, and the report can go to both.
If you look after several sites, we can plan visits across the whole estate and price them together. Each site gets its own report and photos, so records stay tidy.
AHU cleaning in Walsworth
Our AHU cleaning covers sites in Walsworth and the rest of Hertfordshire, in buildings such as offices, schools, healthcare sites and shops. Units are cleaned when the site can spare them, often evenings, overnight or weekends. If you have air handling units with blocked filters and fan sections that haven’t been cleaned in years, we can help, from supply and extract fans, heating and cooling coils and filter sections onwards.
For a building near Walsworth, the visit is planned around how it’s used, and the journey is planned ahead. The method doesn’t change: inspect first, clean, then record what was done.
Good records are part of the job. You get a written report with photos after every visit, covering the work done, any areas we couldn’t access and a recommended next date. Keep it with your fire safety records so it’s ready for an insurer, fire officer or EHO.
- Location
- Walsworth (SG4, SG5)
- Wider area
- Hertfordshire
- Reporting
- Written report with pictures
- Quotes
- A fixed price before we start
- When we work
- When your site is closed, plus a 24/7 line
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
Looking after it afterwards
Good habits slow the build-up between visits. A few tips:
- Keep filter changes on time and recorded
- Do not ignore odours coming through the grilles
- Report water on the plant room floor
- Keep the area around the fresh air intake clear
Once the clean is done, we send a TR19® certificate and a report with before and after photos. They belong in the plant or maintenance log.
Have the unit inspected regularly, in line with the risk-based approach of TR19® Air, rather than waiting for a problem.
Also near Walsworth
What else we do in Walsworth
Walsworth: your questions answered
Can you work in Walsworth outside opening hours?
Yes, nights and weekends are routine for us. The work in Walsworth can fit around your hours. Just give us a ring on 0345 646 2711, or email photos with your opening times and we will plan around them.
Do you cover smaller places like Walsworth?
Yes. Walsworth is within the area we cover across London and the South East. The journey is planned ahead, so a few details about the route help.
Can we book visits on a schedule?
Yes. Send details of the systems and how they’re used, and we will suggest a schedule and quote for it.
Will we get paperwork for the AHU clean?
Yes. A TR19® certificate and photo report are sent after the clean, with any faults we noticed.
Do you do ventilation duct cleaning too?
Yes. We reach the ducts through access panels, with anything inaccessible recorded, with new panels fitted where needed.
Do you have a 24/7 line?
Yes, 24/7. Office hours are Monday to Friday, 8am to 6pm, with the emergency line covering every other hour.
What’s TR19?
It’s BESA’s specification and the benchmark insurers, fire officers and EHOs look to. It sets out inspection, cleaning and record keeping, and it takes a risk-based approach.
What does AHU cleaning cost?
The cost depends on the size of the system, its condition, access and timing. Call for a fixed quote and we’ll usually reply within one working day.
How the job changes from site to site
Fans and fan sections
The fan moves all of the unit’s air, so dirt on it gets spread around. We clean the impeller, housing and surrounding section.
Rooftop and plant room units
Units on roofs and in plant rooms can be awkward to reach. Access is planned during the survey so the quote reflects it.
What your team can do, and what needs us
A few tasks are always specialist work: entering ducts, working on fans, testing dampers and taking grease readings need training, the right equipment and safe access. That’s our job.
Your own staff can handle the daily basics: wiping down canopy surfaces, cleaning filters and keeping a simple log. What they cannot safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
What we are called out for in Walsworth
Most units live out of sight on roofs, in plant rooms or in ceiling voids and are rarely seen by anyone but maintenance staff. Months can pass without anyone looking inside.
The symptoms we’re asked about most include:
- Rooms that smell stuffy when the system runs
- Drain trays holding standing water
- Dirty fans and fan housings
- Air handling units due a clean after building work
Healthcare buildings such as Lister Hospital, about 2.9 miles south-east, depend on their ventilation; if you manage a surgery, clinic or care home near Walsworth, yours matters too.
What to look for in a quote
- Whether the quote is based on a survey or photos
- What happens if part of the system can’t be accessed
- Whether VAT is included
- Whether they’re fully insured
What AHU cleaning looks like in Walsworth
The FSA’s food hygiene register lists about 22 schools, colleges and universities, about 29 hospitals, care homes and childcare premises and about 5 hotels, B&Bs and guest houses with registered kitchens or food service within 1.5 miles or so of the middle of Walsworth. Classrooms, bedrooms and care spaces are often served by ducted air, and that ductwork collects dust over time. Walsworth’s nearest hospital, Lister Hospital, is about 2.9 miles south-east. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital. Walsworth is about 32 miles from central London, well within the area we cover across London and the South East. Visits are booked around your hours, evenings and weekends included.
If you manage offices or shops near Hitchin station, their ventilation can be inspected and cleaned out of hours. School buildings such as Highover Junior Mixed and Infant School are usually done in the holidays, so classrooms aren’t disturbed.
Walsworth is about 1 mile north-east of Hitchin, in Hertfordshire. From the centre of Walsworth to the outskirts, we cover AHU cleaning for every kind of premises, from small sites to large estates. Across Hertfordshire, we cover 381 places, Walsworth among them. For sites nearby, see our Milton Keynes page (22 miles or so).
Work in SG4 and SG5 is surveyed, quoted and booked the same way as anywhere else. If you need AHU cleaning at premises on Green Lane, Orchard Road and Purwell Lane or anywhere close by, we can help. We also cover Poets Estate (1 mile south), Benslow (1 mile south-west), Hitchin (1 mile south-west), Bearton (1 mile west) and Great Wymondley (1 mile south-east). Larger places within reach include Stevenage (5 miles south-east), St Albans (14 miles south), Welwyn Garden City (11 miles south), Harpenden (10 miles south), Hatfield (13 miles south) and Hertford (13 miles south-east).
Around Walsworth
In Walsworth, that means kitchens and buildings near The Millstream pub, Kingshott School and St Mary's Church. Nearby too are Hitchin Girls' School (0.8 miles south-west) and Butts Close (1.2 miles west). Walsworth has its own railway station: Hitchin station. Nearby you’ll also find Wymondley Castle (1.4 miles south-east) and Lister Hospital (2.9 miles south-east). For a walk, there’s Markham's Hill and Purwell Ninesprings.
Why deal with it now?
Dirt left in an air handling unit does not stay in the unit. It moves on into the ductwork and out into the rooms, which is why the unit and the ducts are best cleaned together. A quieter site near Walsworth still needs its system looked after.
The price reflects the work, not guesswork. That’s why we survey first, from pictures or on site, and why the quote is fixed before any work starts.
Why Walsworth businesses choose us
- Work around your opening hours, with 24/7 emergency cover
- Trading since 2009
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Every job surveyed first
Read what affects the cost and our accreditations and certificates.
The process
The first job on site is protection: sheeting goes over floors and surfaces close to the work. Then we make the system safe and start. It takes one overnight shift for many single units, with bigger plant phased, and we clear up before we go. Around Walsworth, access is normally simpler than in a town centre, though gates and roof access are worth mentioning.
- First we agree when the unit can be switched off, including evenings or weekends.
- Before cleaning, each section is photographed.
- We work through the unit from the intake to the outlet.
- We finish with the fan section and the drain tray.
- We take after pictures and issue the certificate and report.
Getting ready for the visit
- Arrange a key holder or contact on site
- Move anything stored near the system
- Tell us about site rules, permits or sign-in
Getting a quote
Here’s what helps us quote: where the site is, what it is and its opening hours, a few photos and the last certificate or report, if there is one. Once you have those, ring 0345 646 2711 or send us an email.