Hertfordshire · Air handling unit cleaning
AHU Cleaning in Codicote
Specialist AHU cleaning for Codicote: diagnosis first, then a fixed quote, the work and a report with photos. Call for a fixed quote.
- Drain trays holding standing water
- Units that have only ever had filter changes
- Debris and leaves in the fresh air intake
Between visits
No system stays clean for ever, but care slows the build-up. Our tips:
- Store the TR19 paperwork where auditors can find it
- Flag stale or damp smells in the supply air
- Keep the area around the fresh air intake clear
- Keep filter changes on time and recorded
Restart the unit with your site team or maintenance contractor once we have finished. Keep an eye on the condensate drain over the next few days to confirm water is draining away.
Make sure access doors and panels on the unit open easily. Sections that are awkward to open are the ones that get skipped.
How we handle AHU cleaning in Codicote
An AHU clean is a thorough examination and treatment of the unit. We look inside each section, clean what we find and record it with photos, so you can see the unit’s condition for yourself. Typical jobs include coils clogged with dust and debris and dirty filters cutting the airflow, across internal panels, heating and cooling coils and supply and extract fans.
For a building near Codicote, the visit is planned around how it’s used, and the journey is planned ahead. The work is the same as in any town: inspect, clean, record.
Accreditations are easy to claim and worth checking. We are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we hold CHAS, SafeContractor and ISO 9001, with full insurance on top.
- Where
- Codicote (SG4)
- Wider area
- Hertfordshire
- Paperwork
- Report and photos after the visit
- Price
- Fixed quote, normally within a working day
- When we work
- Out of hours as standard, 24/7 emergency line
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
Your questions about AHU cleaning in Codicote
Can you work in Codicote outside opening hours?
Yes, out-of-hours work is a big part of what we do. That way a site in Codicote does not have to lose a day’s trading. When you phone us on 0345 646 2711 or send us an email, mention when the site is quiet.
Do you clean school ventilation in Codicote in the holidays?
Yes, out-of-term visits are normal for schools. There are about 2 schools, colleges and universities on the FSA’s food hygiene register within about 1.5 miles of Codicote. Booking early in the term gives the best choice of holiday dates.
How do you keep the site clean during the work?
Floors and surfaces near the work are sheeted before any work starts, and waste is contained as we go. At the end, the area is cleaned down.
What should I send you?
The site address, the type of premises and your opening hours, along with a few photos and any previous report.
How much does AHU cleaning cost in Codicote?
The cost depends on the size of the system, its condition, access and timing. Ask us for a fixed quote and we’ll typically reply within one working day.
Can you clean the ducts connected to the AHU?
Yes, the ductwork, grilles and diffusers the unit serves. The survey shows whether the ducts need cleaning now.
How long will the unit be out of action?
Cleaning takes one overnight shift for many single units, with bigger plant phased. Bigger units can be phased, so ring 0345 646 2711 or send us an email to talk it through.
Which sectors do you work in?
All kinds of commercial and public premises: kitchens, offices, schools, healthcare, retail, leisure and food production. We fit the work around how the site operates.
Honest limits
We won’t sell you work that doesn’t address the problem, so here are the limits:
- The supply and extract ducts, quoted separately
- Coils that are corroded or leaking and need replacing
- Breakdowns that need a mechanical engineer
If you are not sure, just ring 0345 646 2711, or send details by email and we’ll give you a straight answer before you book.
Where we work
- Drain trays
- Filter sections
- Internal panels
- Heating and cooling coils
- Dampers and louvres
- Supply and extract fans
AHU cleaning around Codicote
The FSA’s food hygiene register lists about 5 care, childcare and hospital premises with registered kitchens or food service in Codicote and the streets around it, up to about 1.5 miles out. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. Codicote is about 25 miles from central London, well within the area we cover across London and the South East. A survey and a fixed quote come first, then the visit at a time that suits you. The nearest hospital to Codicote is Queen Elizabeth II Hospital, about 5 miles south-east. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too.
Hospitals such as Queen Elizabeth II Hospital (about 5 miles south-east) show how much a building can rely on clean ventilation, and smaller healthcare sites near Codicote are no different.
Codicote is about 4 miles north-west of Welwyn Garden City, in Hertfordshire. Across the SG4 area, we can take on AHU cleaning. Our Hertfordshire coverage runs to 381 places, and Codicote is one of them. There’s also a page for London, about 25 miles away.
Every address in SG4 is within our area for AHU cleaning, from the main roads to the quietest streets. Local streets include High Street, Baker's Lane and The Green, all of which we cover for AHU cleaning. Other places close to Codicote include Codicote Bottom (1 mile west), Driver's End (1 mile north), Nup End Green (1 mile north-east), Pottersheath (1 mile east) and Ayot St Lawrence (1 mile south-west). We also work in nearby towns such as Watford (15 miles south-west), Hemel Hempstead (12 miles south-west), Stevenage (5 miles north-east), St Albans (8 miles south-west), Welwyn Garden City (4 miles south-east) and Harpenden (5 miles south-west).
Around Codicote
In Codicote, that means kitchens and buildings near The Goat Public House, Monk's Walk School and Danesbury Park. Codicote’s nearest station is Knebworth station, about 2.4 miles north-east of the centre. Well-known places in the area include Howard Centre (3.6 miles south) and Queen Elizabeth II Hospital (5 miles south-east). Open spaces near Codicote include Mardley Heath.
How we price AHU cleaning
You will get a fixed price before any work starts. It’s based on:
- Travel, parking and unloading
- The number of sites or systems
- The size of the system
- Site rules, permits and inductions
A single site or a whole portfolio, we price it on the same basis: the work involved, the access and the timing. The price is fixed before we start.
Asking for a quote
To speed up the quote, send us:
- Any access panels or hatches you can see
- Any symptoms, from odd noises to smells or leaks
- The site address and the type of premises
- Wide pictures of the system and the area around it
Here’s what helps us quote: the address, the type of site and when it’s open, pictures of the system and any previous report or certificate. Then call us on 0345 646 2711 or email us.
Also near Codicote
Also in Codicote
How the job changes from site to site
Drain trays
Older trays can corrode and start leaking. Their condition goes into the report with photos so repairs can be planned.
Filters
Filter condition tells you a lot about the rest of the unit. They’re photographed before and after for your records.
Do you need AHU cleaning in Codicote?
Filters that aren’t changed or cleaned on time clog up, cutting airflow and sometimes letting dirty air bypass them altogether. Then the rest of the unit takes the load.
Keep an eye out for these warning signs:
- Leaves and litter drawn into the unit
- Plant that has been serviced but not cleaned
- Dirty fans and fan housings
- Plant that needs cleaning after a refit
Wherever a school like Codicote Church of England Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time.
What to look for in a quote
- Whether they recommend a next date
- How VAT is shown on the quote
- What insurance they carry
- Exactly which parts of the system are covered
The process
A visit follows the same order every time: protect the area, isolate whatever needs isolating, carry out the AHU cleaning, tidy up and hand over the paperwork. On site, the work takes one overnight shift for many single units, with bigger plant phased. Getting to the system matters more than parking in a place like Codicote, so let us know how to reach it.
- We agree a shutdown window that suits the building.
- Before cleaning, each section is photographed.
- We work through the unit from the intake to the outlet.
- The fan and drain tray are cleaned and the drain checked.
- After pictures are taken and the certificate issued.
How to prepare
- Tell us about site rules, permits or sign-in
- Mention any locked doors, roof access or ceiling voids
- Name a contact who can let us in at the agreed time
Ask for a quote
Quoting starts with a diagnosis, either from photos and details you send or from a site visit. After that, you get a fixed price for the work so you know the cost before any work starts.
Advice
Landlords, agents and facilities managers
Running several sites is easier with one contractor. We work across London and the South East, so a run of sites can go into one programme and kept to a regular schedule.
We also work for facilities teams across offices, schools and healthcare across Hertfordshire. Larger estates can be phased building by building to keep disruption down.