Hertfordshire · Air handling unit cleaning
AHU Cleaning in Lemsford
AHU cleaning for Lemsford and the surrounding area: a survey, a fixed price, careful work and proper paperwork. Call for a fixed quote.
- Rooms that smell stuffy when the system runs
- Air handling units with blocked filters
- Leaves and litter drawn into the unit
AHU cleaning for kitchens and businesses in Lemsford
Our AHU cleaning covers sites in Lemsford and the rest of Hertfordshire, in offices, schools, hospitals, care homes and retail. The work is timed around when the system can be switched off, including evenings, nights and weekends. Common call-outs are for odours coming through the supply air and intake sections clogged with outdoor debris, on heating and cooling coils, filter sections and internal panels.
For a building in or near Lemsford, access is agreed in advance and the visit is planned around the journey.
Think of the report as the system’s health record: dated, with photos, and showing what was done. Grease extract cleans are also certificated to TR19® Grease through the BESCA VHE portal and sits alongside the report.
- Place
- Lemsford (AL8)
- Region
- Hertfordshire
- Reporting
- Report and photos after the visit
- Quote
- A fixed price before any work starts
- Working hours
- Evenings, overnight and weekends; 24/7 emergencies
- Phone
- 0345 646 2711
- Updated
- 30 October 2026
What staff can safely do
Staff cleaning doesn’t replace a specialist visit; it supports it. Regular in-house cleaning slows the build-up, but hidden parts of the system still need specialist attention.
Staff cleaning and specialist work are not the same thing. A daily filter wipe and a weekly filter wash keep grease down at the front of the system, but grease that has passed the filters is out of reach. Reaching it takes a specialist with the right equipment.
When something else is needed
To be straight with you, there are a few things this work won’t fix:
- The supply and extract ducts, quoted separately
- Building management system faults
- Leaking heating or cooling coils
Not sure which it is? You can give us a ring on 0345 646 2711 or email us and we’ll tell you honestly before you book.
Parts of the system we cover
- Supply and extract fans
- Filter sections
- Heating and cooling coils
- Drain trays
- Internal panels
- Dampers and louvres
What affects the quote in Lemsford
Every site gets its own quote. These are the things that affect it:
- Access, including roofs, risers and ceiling voids
- The number of sites or systems
- The scale of the work
- The condition of the system
We do not list prices on the website, because the cost depends on the site in front of us. Call for a fixed quote, and we’ll talk you through it.
Asking for a quote
What to send for a quote:
- The paperwork from the last visit, if you have it
- The postcode and the type of business
- Your opening hours and when the area is out of use
- Photos showing the whole system and its surroundings
Need a price for AHU cleaning? Please give us a ring on 0345 646 2711, or send details by email with a few details about the site. We’ll talk you through the work and send you a fixed quote before anything is booked.
Questions from Lemsford
Can a school’s ventilation in Lemsford be done out of term time?
Yes, and it’s the easiest time to do it. Food Standards Agency records list about 12 schools, colleges and universities with registered kitchens within about a mile and a half of Lemsford. Booking early in the term gives the best choice of holiday dates.
Do you work in villages like Lemsford?
Yes, we work in villages as well as towns, and Lemsford is covered. The journey is planned ahead, so a few details about the route help.
Can you price the work without visiting?
In many cases, yes. With good pictures, the site type and your last report, we can price many jobs. Larger or hidden systems need a survey on site first.
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.
Will the ventilation be off while you clean?
Yes. The fan must be stopped and the unit isolated, and we time the work to suit the site.
Can you clean the AHU out of hours?
Yes. We time the work to fit the building’s hours. In hospitals and care homes, we agree timings with the site team.
Can we book visits on a schedule?
Yes. Plans on a 3, 6 or 12-monthly cycle are available, depending on what the system needs.
How much does AHU cleaning cost in Lemsford?
There’s no set price, as it depends on the job: how big it is, what state it’s in, how we reach it and the working hours. You get a fixed price before any work starts.
Why deal with it now?
Leave an AHU uncleaned and the dirt doesn’t stay put. It’s carried through the ductwork and out of the grilles, which is why the unit and the ducts are best cleaned together. If the system at a site near Lemsford fails, there may be nowhere nearby to move to.
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 are not sure what’s needed, give us a ring on 0345 646 2711, or email photos and we will give you an honest view and a fixed quote.
Why us?
- Out-of-hours work and a 24/7 emergency line
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Every job surveyed first
- Fixed quotes from a survey or pictures
Read what affects the cost or our accreditations.
What we’re called out for in Lemsford
An AHU’s intake draws in outdoor air and everything in it: dust, pollen, leaves and debris. Most of it lands at the intake and the first stage of filters, and some travels further into the unit.
Signs it’s time to call us include:
- Condensate trays that will not empty
- Air handling units never cleaned inside
- Units needing a clean before a new tenant or handover
- Filters that are clogged or overdue
If you manage a school such as Applecroft School, ventilation cleaning is best booked for the holidays.
What your quote should include
- Whether the whole system is included, or only the parts that are easy to reach
- What hours they’ll be on site
- Whether they recommend a next date
- Which accreditations they hold, and whether you can check them
The process
Everything the job needs comes with us, from protective sheeting to tools and access equipment. All we need from you is clear access and the right equipment switched off. On site, the work takes half a day to a full day per unit, with large plant planned over several shifts. We agree a date with you, plan the drive to Lemsford and turn up when the site is quiet.
- First we agree when the unit can be switched off, including evenings or weekends.
- We take before pictures of each section of the unit.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- The fan and drain tray are cleaned and the drain checked.
- We take after pictures and issue the certificate and report.
How to prepare
- Tell us about site rules, permits or sign-in
- Clear loose items from the work area
- Let us know how we reach the system, including roofs, risers and plant rooms
How to get a quote
Photos are the quickest way to a quote: the system from a couple of angles, plus any access panels or hatches. Add the site type and your opening hours, and we can price many jobs without a visit.
Advice
Part by part
Drain trays
Drain trays can rust and leak over time. We record their condition with pictures so you can decide on any repairs.
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.
Towns and villages near Lemsford
Also in Lemsford
Ventilation in Lemsford buildings
Food Standards Agency data includes about 12 schools, colleges and universities and about 3 caring premises (care homes, nurseries and hospitals) across Lemsford and its immediate surroundings (about a mile and a half). Buildings like these often rely on mechanical ventilation, which TR19® Air covers. For Lemsford, the closest hospital is Queen Elizabeth II Hospital, roughly 2.1 miles south-east. Healthcare buildings depend on clean supply and extract ventilation, and the same applies to surgeries, clinics and care homes. Lemsford, about 21 miles from central London, is within our usual area. A survey and a fixed quote come first, then the visit at a time that suits you.
Healthcare ventilation, from large hospitals like Queen Elizabeth II Hospital (about 2.1 miles south-east) to small clinics, depends on clean filters, coils and ducts.
Lemsford is about 2 miles west of Welwyn Garden City, in Hertfordshire. Sites in Lemsford get the same service as everywhere we cover: diagnosis first, a fixed price, out-of-hours working where needed and a written report with photos. Lemsford is one of 381 places in Hertfordshire where we work for commercial clients. Our London page covers sites nearby (21 miles or so).
We cover every part of the AL8 postcode area for AHU cleaning and the roads nearby. Whether your site is on Mill Close, Lemsford Village and Great North Road or a nearby road, our technicians can take on the work. If your site is just outside Lemsford, we cover Stanborough (1 mile south), Coleman Green (2 miles west), Cooper's Green (2 miles south-west), Hatfield (2 miles south) and Smallford (3 miles south-west). We also work in nearby towns such as Watford (12 miles south-west), Hemel Hempstead (10 miles west), Stevenage (8 miles north), St Albans (5 miles south-west), Harpenden (5 miles west) and Hitchin (11 miles north).
Landmarks near Lemsford
In Lemsford, that means kitchens and buildings near Stanborough Park, Stanborough School and The Sun Inn. Lemsford’s nearest station is Welwyn Garden City station, about 1.2 miles east of the centre. Nearby you’ll also find Queen Elizabeth II Hospital (2.1 miles south-east) and The Bunker at Hatfield Police Station (2.1 miles south). The countryside around Lemsford includes Lemsford Springs.