Hertfordshire · Air handling unit cleaning
Air handling unit cleaning in Bishop's Stortford, Hertfordshire
Professional AHU cleaning in and around Bishop's Stortford, timed so the site keeps working and finished with a written report and pictures.
- Leaves and litter drawn into the unit
- Stale or musty smells from the ventilation
- Condensate trays that won’t empty
AHU cleaning in Bishop's Stortford, done properly
The fan pushes every bit of air in the system, so dust on its blades and housing ends up in the airstream. We clean the fan section along with the rest of the unit, once the unit has been shut down and isolated. The work covers supply and extract fans, dampers and louvres and heating and cooling coils, and the jobs we see most are drain trays holding standing water and coils clogged with dust and debris.
For a school, surgery or office in Bishop's Stortford, cleaning is planned around opening hours: out of hours, at weekends or during the holidays.
We’re CHAS and SafeContractor accredited, we hold ISO 9001 and we are fully insured. We’re also a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, trading since 2009.
- Where
- Bishop's Stortford (CM23, CM22)
- Region
- Hertfordshire
- Reporting
- Written report with pictures
- Quote
- Fixed quote, typically within a working day
- When we work
- When your site is closed, plus a 24/7 line
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
What affects the cost of AHU cleaning
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether it’s a one-off visit or part of a schedule
- How big the system is
- Working hours and out-of-hours timing
- Where the site is and how we reach it
No two sites are the same, so we price each one individually. Size, access, the condition of the system and when we can work all play a part.
What to send for a quote
Many jobs can be priced from pictures and some basics. Send what you can of the following:
- Where the site is and what kind of site it is
- Your last certificate, test record or report
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- When the site is open and when it’s quiet
For a fixed quote, phone us on 0345 646 2711, or send details by email with the site type, your trading hours and a short description of the system. Photos and the last report, if you have one, make the quote quicker. You will usually have a quote within one working day.
When something else is needed
Some problems need a different service or another trade:
- Problems with the unit’s controls or sensors
- Airflow problems caused by the system’s design
- Damaged coils beyond cleaning
If you are not sure, just phone us on 0345 646 2711, or email photos and we will give you a straight answer.
What we work on in Bishop's Stortford
- Dampers and louvres
- Internal panels
- Drain trays
- Heating and cooling coils
- Supply and extract fans
- Filter sections
Bishop's Stortford questions
Is Bishop's Stortford in your area for AHU cleaning?
Yes, Bishop's Stortford is covered. A fixed quote typically follows within one working day of the survey details.
Do you work at weekends in Bishop's Stortford?
Yes, out-of-hours work is a big part of what we do. Your customers, staff or residents in Bishop's Stortford needn’t be disturbed. Your opening times are the first thing we ask for.
Is there a report after cleaning?
Yes. A TR19® certificate and photo report are sent after the clean, including anything we think needs attention.
Can you clean the ducts connected to the AHU?
Yes. Ventilation ductwork cleaning to TR19® Air is part of what we do. It’s often worth doing both at once, and we can survey both on the same visit.
What do you do with what you remove?
Anything we remove is contained as we work and taken away with us, from grease and debris to used cleaning water. None of it is left on site.
What information do you need?
Only a few details: where it is, what kind of site, when it’s open and the access. Photos and any previous paperwork make it quicker. Then call us on 0345 646 2711 or use the quote form.
Can you price the work without visiting?
Often, yes. Photos of the system and the access, plus your opening hours and last report, are often enough. Where we cannot see enough, we arrange a survey.
What types of premises do you cover?
Any commercial site with kitchens or ventilation, from a single café to a large school. Hotels, schools, care homes, offices, shops and leisure sites are all part of our work.
What we do, step by step
On the day, we arrive at the time agreed with you, which is often after service, overnight or at a weekend. Anything that needs to be off for the work is switched off and left to cool before any work starts, and floors and nearby surfaces are sheeted. The work itself takes one overnight shift for many single units, with bigger plant phased. A few photos of the system and its access points help us plan a visit in Bishop's Stortford.
- The survey covers the unit, its access and how it can be shut down.
- The area is protected and the unit made safe.
- Each section is cleaned of dust, debris and slime.
- We clean the coils and clear the tray and drain.
- We close every panel, hand the unit back and send the report and certificate.
How to prepare
- Let us know how we reach the system, including roofs, risers and plant rooms
- Tell us where we can park and unload
- Find the previous report, if there is one
Get a fixed quote
Some systems can be priced from pictures; others need a survey. Big or complicated sites, and systems that are hard to see in photos, get a survey first. Either way, the quote is fixed before any work is booked.
Related advice
Between visits
A little care between visits keeps the system in better shape. Our advice:
- Store the TR19 paperwork where auditors can find it
- Look at the condensate drain whenever the unit is serviced
- Note any water around the unit or leaks below it
- Keep filter changes on time and recorded
When we have closed the unit up, it can be restarted with your site team. Check the drain tray is emptying over the first few days to confirm water is draining away.
Have the unit inspected regularly, in line with the risk-based approach of TR19® Air, rather than waiting for a problem.
Nearby places to Bishop's Stortford
Also in Bishop's Stortford
What we are called out for in Bishop's Stortford
Filters catch most of the dust, but not all of it. The fine dust that passes the filters lands on the coils, the fan and the internal panels, building up layer by layer.
The symptoms we are asked about most include:
- Units needing a clean before a new tenant or handover
- Dirty fans and fan housings
- Plant that has been serviced but not cleaned
- Dust-coated heating and cooling coils
If you run a surgery, dental practice or care home near Bishop's Stortford, clean ventilation matters as much to you as to a hospital like Herts and Essex Hospital (about 0.8 miles east).
What to look for in a quote
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor
- When they can work, and whether that’s outside your opening hours
- If they look at the system before pricing
- When the next visit should be, and why
Bishop's Stortford buildings and their air
There are about 23 schools, colleges and universities and about 15 hospitals, care homes and childcare premises on the FSA’s food hygiene register within roughly a mile and a half of the centre of Bishop's Stortford. Classrooms, bedrooms and care spaces are often served by ducted air, and that ductwork collects dust over time. Herts and Essex Hospital is the nearest hospital, about 0.8 miles east of Bishop's Stortford. Clean air matters most where people are unwell, and that’s as true in a care home as in a hospital. About 28 miles out from central London, Bishop's Stortford is part of the South East area we work across. We work evenings, overnight and at weekends, so the visit fits around the site.
Wherever a school like St Michael's Church of England Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time. For workplaces around Bishops Stortford station with mechanical ventilation, cleaning can be done in the evening or at weekends.
Bishop's Stortford is in Hertfordshire. From the centre of Bishop's Stortford to the outskirts, AHU cleaning is available to all kinds of commercial premises, from small sites to large estates. Our Hertfordshire coverage runs to 381 places, Bishop's Stortford among them. Our Chelmsford page covers sites nearby, about 17 miles away.
Here we cover the CM23 and CM22 postcode area for AHU cleaning. Local streets include Market Street, High Street and Station Road, and we cover them all for AHU cleaning. Bishop's Stortford sits on or near the A120 and A1059, so getting to you is simple for evening and night visits. Close by, we work in Thorley Street (1 mile south), Thorley (1 mile south-west), Birchanger (2 miles north-east), Great Hallingbury (2 miles south-east) and Bury Green (2 miles west). Within a short drive, we also cover Stevenage (15 miles west), Hoddesdon (11 miles south-west), Cheshunt (14 miles south-west), Hertford (11 miles south-west), Ware (9 miles south-west) and Broxbourne (11 miles south-west). As one of the bigger places in Hertfordshire, Bishop's Stortford has commercial sites of every size, and we cover all of them for AHU cleaning.
Local landmarks in Bishop's Stortford
Around Bishop's Stortford, our work takes us to kitchens and buildings near The Port Jackson pub and St Mary's Catholic School and the streets around them. There’s a railway station in Bishop's Stortford itself: Bishops Stortford station. A little further out are Herts and Essex Hospital (0.8 miles east) and Moated mound (2.4 miles north-west). The countryside around Bishop's Stortford includes Rushy Mead and Portingbury Hills.
How the job changes from site to site
Filters
Filters are the first line of defence in the unit. We check them, and clean or change them as agreed in the quote, and clean the filter housing.
Rooftop and plant room units
Rooftop units take the weather, and intakes can collect leaves and debris. The intake section gets particular attention.
Why deal with it now?
Standing water in a drain tray doesn’t clear itself. Leave it and you risk overflows, leaks into the space below and odours carried round the building. Dealing with it early keeps the clean straightforward. Grease, dust and wear all build up with time.
Putting the work off seldom saves money. Build-up, wear and faults tend to get worse, not better, which can make the next visit longer. If you’re unsure, ring 0345 646 2711 or drop us a line for straight advice and a fixed quote.
Why Bishop's Stortford businesses choose us
- We diagnose before we treat
- One contact for all your sites in London and the South East
- A fixed price before any work starts
- Photo reports with every job