Hertfordshire · Air handling unit cleaning
Hay Street AHU cleaning
AHU cleaning for commercial sites in Hay Street and across Hertfordshire. BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease.
- Coils clogged with dust and debris
- Intake sections clogged with outdoor debris
- Rooms that smell stuffy when the system runs
AHU cleaning in Hay Street
We clean the parts of the unit where dirt and moisture gather: the filter section, heating and cooling coils, drain trays, fan and casing. Every clean comes with a TR19® certificate and before and after pictures in a report. Typical jobs include air handling units never cleaned inside and dust-coated heating and cooling coils, on filter sections, heating and cooling coils and drain trays.
Rural buildings with mechanical ventilation, such as care homes and country hotels, often keep their units in roof spaces or outbuildings, where filters and drain trays get forgotten.
We’re CHAS and SafeContractor accredited, we hold ISO 9001 and we are fully insured. On top of that, we’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we have been trading since 2009.
- Where
- Hay Street (SG11)
- Wider area
- Hertfordshire
- Reporting
- Photo report after every visit
- Quote
- Fixed quote, typically within a working day
- When we work
- Overnight and weekend work, 24/7 emergency callout
- Call
- 0345 646 2711
- Last updated
- 30 October 2026
Between visits
A little care between visits keeps the system in better shape. We recommend:
- Keep the area around the fresh air intake clear
- Report stiff or damaged access doors
- Change filters on schedule and log each change
- Plan the next inspection before the last report gets filed away
The report suggests a date for the next inspection or clean, based on what we found. TR19® Air is risk-based, so the interval depends on the unit and how the building is used.
Don’t let leaves, litter or stored materials build up near the fresh air intake. Anything around the intake is likely to be drawn in.
Hay Street buildings and their air
We cover Hay Street, about 29 miles from central London, as part of our work across London and the South East. Evening, overnight and weekend visits are all possible.
If you manage a school such as Jenyns First School and Nursery, ventilation cleaning is best booked for the holidays.
Hay Street is about 7 miles north-west of Bishop's Stortford, in Hertfordshire. We carry out AHU cleaning for businesses, landlords and public buildings in Hay Street and the rest of Hertfordshire. Hay Street is one of 381 towns, villages and districts in Hertfordshire where we work for AHU cleaning. There’s also a page for Chelmsford, roughly 23 miles from Hay Street.
Work in SG11 follows the same survey, fixed quote and written report as everywhere else we cover. We also cover the places around Hay Street: Braughing (1 mile south-east), Westmill (2 miles west), Aspenden (2 miles north-west), Great Hormead (2 miles north) and Buntingford (3 miles north-west). We also work in nearby towns such as Stevenage (9 miles west), Bishop's Stortford (7 miles south-east), Welwyn Garden City (12 miles south-west), Hitchin (13 miles west), Hoddesdon (11 miles south) and Cheshunt (15 miles south).
Near you in Hay Street
We work in commercial kitchens and buildings around Adam And Eve Public House. A little further out are Brent Pelham (3.7 miles north-east).
How it works
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 first, and the area around the work is covered and protected. On site, it takes half a day to a full day per unit, with large plant planned over several shifts. In a small place like Hay Street, the journey is planned ahead and the visit arranged around the site’s hours.
- We survey the unit from photos or on site and agree what’s included.
- With your site team, the unit is switched off and isolated, then the area around it protected.
- Filters are dealt with as agreed, and the coils, fan and casing cleaned.
- Standing water and slime come out of the tray and the drain is checked.
- You get a TR19® certificate and a photo report.
How to prepare
- Mention any parking or loading restrictions
- Tell us about access, such as roof hatches, plant rooms, ceilings or locked areas
- Mention any sign-in, permit or induction we need
Get a fixed quote
Here’s what helps us quote: the address, the type of site and when it’s open, a few pictures and any previous report or certificate. Once you have those, ring 0345 646 2711 or email us.
Related advice
Landlords, agents and facilities managers
Where a tenant occupies the premises but the landlord owns the building, it’s worth checking the lease for who maintains the systems. We can quote either party and send the paperwork to whoever needs it.
Landlords, managing agents and facilities managers book us, not only the businesses that use the systems. Where a system serves more than one tenant, such as a shared riser, it helps to agree who arranges the work, and we can quote for the whole system.
When to call us in Hay Street
Filters catch most of the dust, but not all of it. What gets through settles on coils, fans and the inside of the casing, building up layer by layer.
Look out for these warning signs:
- Dirty fans and fan housings
- Air handling units with blocked filters
- Plant that needs cleaning after a refit
- Coils clogged with dust and debris
Around Hay Street, as anywhere, ventilation cleaning begins with an inspection.
What your quote should include
- Which accreditations they hold, and whether you can check them
- Whether they’re fully insured
- What paperwork you get at the end
- When they can work, and whether that’s outside your opening hours
Hay Street questions
Do you cover smaller places like Hay Street?
Yes. Hay Street 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.
Is Hay Street in your area for AHU cleaning?
Yes. We work across London and the South East, and Hay Street is part of that. Just call us on 0345 646 2711 or drop us a line with a few details of the site.
What types of premises do you cover?
Commercial premises of every kind: kitchens, offices, schools, healthcare, retail, leisure and food production. Work is timed around how each site runs.
Where does the waste go?
Anything we remove is contained as we work and taken away with us, including grease, debris and dirty water. We don’t leave it behind.
Can you fix a faulty AHU?
Mechanical repairs to the unit are for your HVAC maintenance contractor. We clean the unit and report anything we see that needs attention.
What does AHU cleaning cost?
We do not publish prices, because the cost 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 work begins.
How much notice do you need?
Earlier is better, especially for out-of-hours work. We typically quote within one working day, and emergencies are covered by our 24/7 line.
How often do AHUs need cleaning?
Inspection under TR19® Air decides it. Units in heavy use or in sensitive buildings may need attention more often.
Why it’s worth doing now in Hay Street
Stuffy rooms and stale smells in a building in Hay Street can sometimes be traced back to the AHU. A clean tackles the source instead of masking it. Planning a trip to Hay Street ahead is easier for everyone than a rushed one.
You won’t find a price list here, because each job is priced on what it involves. Call for a fixed quote, and we will talk you through it.
Why Hay Street businesses choose us
- CHAS, SafeContractor and ISO 9001
- Ventilation hygiene specialists since 2009
- Fixed quotes, typically within one working day
- Evenings, overnight and weekends, plus 24/7 emergency callout
Take a look at how cleaning jobs are priced or our accreditations.
How the job changes from site to site
Heating and cooling coils
A dirty coil holds back the air and makes heating and cooling less effective. Cleaning restores the open path through the fins.
Rooftop and plant room units
Many AHUs sit on roofs or in plant rooms with limited access. We plan safe access as part of the survey, before we quote.
Fixed quotes for AHU cleaning in Hay Street
The survey tells us what the work involves. We look at:
- Access, including roofs, risers and ceiling voids
- The condition we find in the survey
- A single visit or a regular plan
- Parking and loading at the site
One small site or a whole estate, the quote is built the same way: what needs doing, how we get to it and when. You’ll have a fixed price before any work starts.
Helping us quote
Before you ask for a quote, gather:
- The paperwork from the last visit, if you have it
- The site address and the type of premises
- Problems your staff have spotted
- How we’d reach plant on a roof or in a plant room
Photos are the quickest way to a quote: wide shots of the system, close-ups of anything that worries you and how we’d get to it. Tell us what kind of site it is and when it’s open, and we can price many jobs without a visit.