Hertfordshire · Air handling unit cleaning
Air handling unit cleaning in Northchurch, Hertfordshire
Air handling unit cleaning for businesses, landlords and public buildings in Northchurch. CHAS, SafeContractor and ISO 9001, and fully insured.
- Drain trays holding standing water
- Intake sections clogged with outdoor debris
- Dirty coils holding back the airflow
How the job changes from site to site
Drain trays
The drain tray collects water from the cooling coil. Standing water and slime are removed and the outlet is checked.
Fans and fan sections
Every bit of air passes the fan, so a dirty fan sends dirt downstream. We clean the impeller, housing and surrounding section.
AHU cleaning in Northchurch, done properly
Our AHU cleaning covers sites in Northchurch 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. If you are dealing with intake sections clogged with outdoor debris and units needing a clean before a new tenant or handover, we can put it right.
For a building near Northchurch, the visit is planned around how it’s used, and the journey is planned ahead. The method does not change: inspect first, clean, then record what was done.
We are CHAS and SafeContractor accredited, we hold ISO 9001 and we’re fully insured. We’re also a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we have been trading since 2009.
- Where
- Northchurch (HP4)
- Region
- Hertfordshire
- Paperwork
- Written report with photos
- Quotes
- A fixed quote up front
- Working hours
- Nights, weekends or holidays to suit you
- Phone
- 0345 646 2711
- Reviewed
- 30 October 2026
Also near Northchurch
Other services in Northchurch
Northchurch: your questions answered
Can you come to Northchurch after we close?
Yes. We work evenings, overnight and at weekends. The work in Northchurch can fit around your hours. When you call 0345 646 2711, or send details by email, mention when the site is quiet.
Is Northchurch within the area you cover?
Yes. Northchurch is within the area we cover across London and the South East. Just mention lanes, gates or anything else about the site when you book.
How much notice should we give?
For planned work, earlier is better, particularly if your next visit is nearly due. Emergencies are different, because our line is open 24/7.
When should our AHU next be cleaned?
TR19® Air takes a risk-based approach, so it depends on inspection rather than a fixed interval. We recommend a next date in each report.
What is TR19?
TR19® is the BESA specification for keeping ventilation systems clean. TR19® Grease, a standalone specification since 2019, covers grease in kitchen extract systems, and TR19® Air covers general supply and extract systems.
Do you need to switch the unit off?
Yes, while the clean is under way. We can work evenings, overnight or at weekends so the building is not left without ventilation when it’s busy.
Can you clean the ducts connected to the AHU?
Yes. We reach the ducts through access panels, with anything inaccessible recorded, with new panels fitted where needed.
Can you quote from pictures?
Yes, where the photos show enough. If not, a site survey comes first, then a fixed quote.
What happens on the day
Our technicians bring everything the work needs, including protection sheets, the right tools and access kit. All we need from you is clear access and the right equipment switched off. The visit takes anything from half a day for one small unit to several shifts for a plant room full of them. In a smaller place like Northchurch, parking is rarely the issue, but tell us about gates, roof access and opening hours.
- We agree a shutdown window that suits the building.
- We take before pictures of each section of the unit.
- We work through the unit from the intake to the outlet.
- The fan and drain tray are cleaned and the drain checked.
- We take after pictures and issue the certificate and report.
Before we arrive
- Mention any sign-in, permit or induction we need
- Dig out any earlier paperwork for the system
- Clear the space around the work
Getting a quote
The quickest way to a quote is to send pictures: wide shots of the system, close-ups of anything that worries you and how we’d get to it. Add the site type and your opening hours, and many jobs can be priced from that alone.
Advice
Northchurch buildings and their air
There are about 10 schools, colleges and universities and about 12 care, childcare and hospital premises on the FSA’s food hygiene register within about 1.5 miles of central Northchurch. Classrooms, bedrooms and care spaces are often served by ducted air, and that ductwork collects dust over time. About 28 miles out from central London, Northchurch is part of the South East area we work across. A survey and a fixed quote come first, then the visit at a time that suits you. Northchurch’s nearest hospital, Hemel Hempstead Hospital, is about 5.2 miles east. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too.
School buildings such as St Mary's CofE Primary School are normally done in the holidays, so classrooms are not disturbed.
Northchurch is about 1 mile north-west of Berkhamsted, in Hertfordshire. From the centre of Northchurch to the outskirts, AHU cleaning is available to all kinds of commercial premises, from small sites to large estates. Northchurch is one of 381 towns, villages and districts in Hertfordshire where we work for commercial clients. Our Milton Keynes page covers sites nearby (20 miles or so).
All of HP4 is covered for AHU cleaning, from busy streets to back roads. Local streets include New Road, Dell Road and Bell Lane, all of which we cover for AHU cleaning. Nearby, we also carry out AHU cleaning in Berkhamsted (1 mile south-east), Norcott Hill (1 mile north), Ashley Green (2 miles south), Ashridge (2 miles north-east) and Frithsden (3 miles east). Larger places within reach include Watford (11 miles south-east), Hemel Hempstead (6 miles east), St Albans (11 miles east), Harpenden (11 miles east), Hatfield (15 miles east) and Borehamwood (15 miles south-east).
Around Northchurch
We work in commercial kitchens and buildings around Saint George And The Dragon Public House and Ashlyns School. For rail, the closest station is Berkhamsted station, about 1.2 miles east of the centre. Nearby you’ll also find Hemel Hempstead Hospital (5.2 miles east) and Hawridge Court (2.4 miles south-west). The countryside around Northchurch includes Pavis Wood and Sands Bank.
What affects the cost of AHU cleaning
Sites vary more than people expect. What affects the quote:
- Access, including roofs, risers and ceiling voids
- Any permits to work or inductions
- Parking and loading at the site
- One-off work versus a regular cycle
Whatever the type of site, the quote works the same way: how much there is, how we reach it, what state it’s in and when we can work. Ask for a fixed quote and we’ll go through it with you.
Asking for a quote
We can often survey from photos. The most useful are:
- The roof, plant room or outside wall the system runs to
- A few general shots of the system
- The site address and the type of premises
- The paperwork from the last visit, if you have it
Every quote begins with a look at the system, either from pictures and details you send or from a site visit. Then we send a fixed price, before any work starts.
Staff cleaning versus specialist work
Good housekeeping makes our visits easier, not unnecessary. Regular in-house cleaning slows the build-up, but the parts you can’t see still need a specialist at the right interval.
In-house cleaning and specialist cleaning do different jobs. Wiping filters daily and washing them weekly keeps the visible parts in order, but grease that has passed the filters is out of reach. Reaching it takes a specialist with the right equipment.
Common problems we fix in Northchurch
Dirt in an AHU matters in two ways: air quality, since the unit feeds occupied rooms, and performance, since dirt makes it strain. For the people using the building every day, that’s the air they breathe for hours on end.
What we’re most often called out for:
- Dust-coated heating and cooling coils
- Dirty fans and fan housings
- Plant that needs cleaning after a refit
- Drain trays holding standing water
Healthcare ventilation, from large hospitals like Hemel Hempstead Hospital (about 5.2 miles east) to small clinics, depends on clean filters, coils and ducts.
Comparing quotes
- Whether the quote shows VAT
- Whether the whole system is included, or only the parts that are easy to reach
- How areas they can’t reach will be recorded
- Which accreditations they hold, and whether you can check them
When something else is needed
Before you book, it helps to know what’s not included:
- A system that’s undersized for the building
- Ductwork downstream of the unit, which is a separate clean
- Damaged coils beyond cleaning
If you’re not sure, just call us on 0345 646 2711, or send details by email and we will give you a straight answer before you book.
What we work on in Northchurch
- Internal panels
- Drain trays
- Dampers and louvres
- Supply and extract fans
- Filter sections
- Heating and cooling coils
Looking after it afterwards
No system stays clean for ever, but care slows the build-up. Our tips:
- Keep inspection doors on the unit in good order
- Look at the condensate drain whenever the unit is serviced
- File each AHU report in the maintenance log
- Book the next check in line with the report
Restart the unit with your site team or maintenance contractor once we’ve finished. Check the drain tray is emptying over the first few days to confirm water is draining away.
Regular filter changes are the best protection an AHU has. Once filters clog, dirt starts getting past them.