Hampshire · Air handling unit cleaning
AHU Cleaning in Thedden
AHU cleaning for Thedden and the surrounding area: diagnosis first, then a fixed quote, the work and a report with pictures. Call for a fixed quote.
- Leaves and litter drawn into the unit
- Condensate trays that won’t empty
- Dust built up on fan impellers
Staff cleaning versus specialist work
Day-to-day cleaning is something your team can do: wiping down canopy surfaces, cleaning filters and keeping a simple log. What they cannot safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
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. That part needs specialist access and equipment.
How we handle AHU cleaning in Thedden
Our AHU cleaning covers sites in Thedden and the rest of Hampshire, in buildings such as offices, schools, healthcare sites and shops. The work is timed around when the system can be switched off, including evenings, nights and weekends. If you are dealing with odours coming through the supply air and air handling units never cleaned inside, we can put it right.
Work in a small place like Thedden starts with agreeing access and timings.
Insurers, fire officers and environmental health officers all look at records. So every job comes with a written report and photos, and grease extract cleans come with a TR19® certificate issued through the BESCA Vent Hygiene Elite portal.
- Place
- Thedden (GU34)
- Wider area
- Hampshire
- Reporting
- Report and photos after the visit
- Quotes
- A fixed quote up front
- Hours
- Nights, weekends or holidays to suit you
- Telephone
- 0345 646 2711
- Updated
- 30 October 2026
Honest limits
We’ll always give you a straight diagnosis, so here’s what AHU cleaning will not do:
- Airflow problems caused by the system’s design
- Ductwork downstream of the unit, which is a separate clean
- Leaking heating or cooling coils
If you are not sure, just call us on 0345 646 2711 or drop us a line and we will give you a straight answer before you book.
What we work on in Thedden
- Drain trays
- Internal panels
- Dampers and louvres
- Heating and cooling coils
- Supply and extract fans
- Filter sections
When to call us in Thedden
No filter stops everything. What gets through settles on coils, fans and the inside of the casing, a little more each month.
What we’re most often called out for:
- Fan sections that haven’t been cleaned in years
- Dirty filters cutting the airflow
- Debris and leaves in the fresh air intake
- Drain trays holding standing water
Healthcare buildings such as Alton Community Hospital, about 1.6 miles east, depend on their ventilation; if you manage a surgery, clinic or care home near Thedden, yours matters too.
Before booking anyone
- What happens if part of the system can’t be accessed
- Whether VAT is included
- If the quote is a fixed price or an estimate
- Whether a written report and photos are included
Keeping the system healthy
Think of this as the after-treatment advice, in brief:
- Change filters on schedule and log each change
- Flag stale or damp smells in the supply air
- Watch for drips or damp patches near the plant
- Look at the condensate drain whenever the unit is serviced
The report shows each section of the unit before and after, and note any part we couldn’t get to. Any defects we noticed, like a leaking tray or damaged lining, are listed.
Make the drain tray part of every maintenance visit. A drain that is cleared early never gets to the slime stage.
AHU cleaning around Thedden
Thedden is about 47 miles from central London, well within the area we cover across London and the South East. We work evenings, overnight and at weekends, so the visit fits around the site. The nearest hospital to Thedden is Alton Community Hospital, about 1.6 miles east. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital.
If you manage a school such as Amery Hill School, ventilation cleaning is best booked for the holidays.
Thedden is about 2 miles west of Alton, in Hampshire. We carry out AHU cleaning for businesses, landlords and public buildings in Thedden and the rest of Hampshire. Across Hampshire, we cover 683 places, Thedden among them. Our Reading page covers sites nearby (21 miles or so).
Every address in GU34 is covered for AHU cleaning, from the main roads to the quietest streets. Other places close to Thedden include Beech (1 mile south-east), Wivelrod (1 mile south-west), Bentworth (1 mile north-west), Holt End (1 mile west) and New Copse (2 miles west). We also work in nearby towns such as Basingstoke (9 miles north), Winchester (14 miles south-west), Farnborough (15 miles north-east), Fleet (12 miles north-east), Aldershot (13 miles north-east) and Petersfield (10 miles south).
Around Thedden
For rail, the closest station is Alton station, roughly 2.6 miles east of the centre. Nearby you will also find Alton Community Hospital (1.6 miles east) and Barton Castle (3.9 miles west). Green spaces nearby include King's Hill.
What happens on the day
Your trading hours come first. We book the visit for a time the area is closed, whether that is an evening, overnight or a weekend. When the team arrives, the work area is protected and the relevant equipment is switched off to cool, and the work takes half a day to a full day per unit, with large plant planned over several shifts. A few photos of the system help us make the most of a visit to a place like Thedden.
- First the unit is surveyed, from photos or a visit, and the scope agreed.
- With your site team, the unit is switched off and isolated, then the area around it protected.
- Filters, coils, fan section and casing are cleaned in turn.
- Standing water and slime come out of the tray and the drain is checked.
- A TR19® certificate and photo report follow the clean.
Getting ready for the visit
- Tell us about site rules, permits or sign-in
- Let us know about parking and loading
- Let us know when the site is closed or quiet
Ask for a quote
For AHU cleaning in Thedden, phone us on 0345 646 2711 or drop us a line. Let us know the site type and the opening hours, plus photos or the previous report if they’re to hand. A fixed quote normally follows within one working day.
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FAQs for Thedden
Do you cover smaller places like Thedden?
Yes. Thedden is within the area we cover across London and the South East. The journey is planned ahead, so a few details about the route help.
Do you offer AHU cleaning in Thedden?
Yes, we work in Thedden and the places around it. You can call 0345 646 2711 or drop us a line and tell us what needs doing.
How often should an air handling unit be cleaned?
Inspection under TR19® Air decides it. Units in heavy use or in sensitive buildings may need attention more often.
Is there a survey before the work?
Yes, every time. Diagnosis comes before treatment: the survey shows what needs doing and what access we need and the fixed quote is built on it.
What do you clean inside the unit?
We clean the filter section, heating and cooling coils, drain trays, fan and internal casing. Filters are cleaned or changed as agreed in the quote.
Will the ventilation be off while you clean?
Yes. Cleaning needs the unit off and isolated, so we plan it for a time that suits the building.
Do you offer emergency callouts?
Yes, any time. For anything urgent, such as a fan failure or damage after a fire, ring the 24/7 line and we’ll talk you through the next steps.
How long will the unit be out of action?
It takes from a few hours for a compact unit to a day or more for a large one. Size, layout and how dirty it is decide the rest, and we’ll confirm the time when we quote.
What affects the cost of AHU cleaning
Every site gets its own quote. This is what makes a difference:
- Travel, parking and unloading
- Whether it’s a one-off visit or part of a schedule
- Any permits to work or inductions
- The times the site is available
Putting the work off seldom saves money. Build-up, wear and faults tend to get worse, not better, and a neglected system can mean more work. If you are unsure, phone us on 0345 646 2711 or drop us a line and we will give you an honest view and a fixed quote.
What we need to know
Many jobs can be priced from photos and some basics. Useful things to send:
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- Wide photos of the system and the area around it
- The site address and the type of premises
- The paperwork from the last visit, if you have it
To help us quote: where the site is, what it is and its opening hours, photos of the system and the last certificate or report, if there is one. Then call 0345 646 2711 or drop us a line.
Other services in Thedden
Leave it or put it right?
Dirt left in an air handling unit does not stay in the unit. It’s carried through the ductwork and out of the grilles, which is why the unit and the ducts are best cleaned together. Somewhere as small as Thedden, losing a kitchen or building to a fault is felt by everyone who uses it.
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. Call for a fixed quote and we will go through it with you.
Why us?
- Fully insured
- CHAS, SafeContractor and ISO 9001
- One number for every site across the South East and London
- Fixed quotes, usually within one working day