Surrey · Air handling unit cleaning
Air handling unit cleaning in Charleshill, Surrey
Professional AHU cleaning in and around Charleshill, timed so the site keeps working and finished with a written report and pictures.
- Dust built up on fan impellers
- Plant that needs cleaning after a refit
- Blocked condensate drains and slimy trays
How we handle AHU cleaning in Charleshill
Where a building in Charleshill has had little more than filter changes, the coils, fan and casing can be carrying far more dirt than anyone has seen. A full clean deals with all of it. The work covers dampers and louvres, supply and extract fans and drain trays, and people most often call us about dirty fans and fan housings and units that have only ever had filter changes.
In a village or hamlet like Charleshill, few buildings have mechanical ventilation, but those that do need it inspected and cleaned like any other.
The sign-off is always in writing: a dated report with photos of the work, plus a certificate through the BESCA Vent Hygiene Elite portal when the work is a TR19® Grease clean. It shows what was done and what, if anything, couldn’t be reached.
- Location
- Charleshill (GU10)
- Region
- Surrey
- Reporting
- Report and pictures after the visit
- Price
- Fixed quote, normally within a working day
- Hours
- Nights, weekends or holidays to suit you
- Phone
- 0345 646 2711
- Reviewed
- 30 October 2026
What AHU cleaning looks like in Charleshill
At about 35 miles from central London, Charleshill sits well inside the area we cover. Evening, overnight and weekend visits are all possible. For Charleshill, the closest hospital is Milford Hospital, roughly 4.6 miles east. Healthcare buildings depend on clean supply and extract ventilation, and the same applies to surgeries, clinics and care homes.
Hospitals such as Milford Hospital (about 4.6 miles east) show how much a building can rely on clean ventilation, and smaller healthcare sites near Charleshill are no different.
Charleshill is about 3 miles south-east of Farnham, in Surrey. Every kind of commercial site in Charleshill, we can take on AHU cleaning. We can work out of hours so trading isn’t interrupted. Charleshill is one of 395 places in Surrey we cover for commercial clients. You can also see our page for Guildford, about 8 miles away.
We cover every part of GU10 for AHU cleaning and the roads nearby. We cover sites on Farnham Road and Whitmead Road and nearby roads. Main roads around Charleshill include the B3001, so getting to you is simple for evening and night visits. We also cover the places around Charleshill: Tilford (1 mile west), Elstead (1 mile south-east), Tilford Common (2 miles south-west), Tilford Reeds (2 miles west) and Rushmoor (3 miles south-west). Further out, we also cover Guildford (8 miles north-east), Woking (11 miles north-east), Camberley (10 miles north), Farnham (3 miles north-west), Frimley (8 miles north) and Haslemere (7 miles south).
Near you in Charleshill
In Charleshill, that means kitchens and buildings near The Donkey pub and Thundry Meadows and the streets around them. The nearest railway station is Farnham station, about 3.2 miles north-west of the centre. Other landmarks nearby include Museum of Farnham (3.7 miles north-west) and Milford Hospital (4.6 miles east). Green spaces nearby include Runfold Wood and Upper Lake.
Common questions in Charleshill
Can you work in Charleshill outside opening hours?
Yes, nights and weekends are routine for us. That way a site in Charleshill does not have to lose a day’s trading. Your opening times are the first thing we ask for.
Is AHU cleaning available in Charleshill?
Yes, Charleshill is within the area we cover across London and the South East. To start, phone us on 0345 646 2711 or drop us a line with a few pictures of the system.
How often do AHUs need cleaning?
There’s no single answer; it comes down to the building and the unit. Inspection tells you when cleaning is needed, and the report recommends a next date.
Which parts of an air handling unit do you clean?
The main parts are the filters, coils, drain tray, fan and inside of the casing. The survey confirms what’s in your unit before we quote.
Is there a report after cleaning?
Yes, a TR19® certificate and a photo report. It includes a recommended date for the next check.
Is there a survey before the work?
Yes. For many sites, photos and a few details are enough, and larger or hidden systems get a visit.
How long does it take to clean an air handling unit?
Typically the clean takes from a few hours for a compact unit to a day or more for a large one. The shutdown is planned to fit, out of hours if needed.
Do you do ventilation duct cleaning too?
Yes. We clean supply and extract ductwork to TR19® Air as well. Cleaning the unit and ducts together often makes sense, and we can survey both on the same visit.
Leave it or put it right?
A clogged coil or dirty fan makes the unit work harder for the same airflow. That means more wear on the motor and rooms that feel less fresh, and a planned clean is far less disruptive than a breakdown. Planning a trip to Charleshill ahead is easier for everyone than a rushed one.
What you pay reflects the actual work. That is why every job is surveyed first, and the price is agreed before we start.
Why book with us
- We are fully insured
- Each visit written up, with photos
- We diagnose before we treat
- Fixed quotes, normally within one working day
Read how cleaning jobs are priced and how to check a contractor.
Nearby places to Charleshill
Also in Charleshill
When to call us in Charleshill
Planned maintenance often covers belts, motors and filters but not cleaning. That means a unit can tick every service box and still be carrying years of dirt.
If you notice any of these, it’s worth a diagnosis:
- Filters that are clogged or overdue
- Debris and leaves in the fresh air intake
- Air handling units never cleaned inside
- Air handling units due a clean after building work
For schools like Waverley Abbey CofE Junior School, the holidays are the usual time to inspect and clean ventilation.
Before you book anyone
- Whether a written report and photos are included
- How VAT is shown on the quote
- If the quote is a fixed price or an estimate
- Proof of insurance
In-house cleaning or a specialist?
For ventilation and air handling systems, in-house care is mostly about checks: keeping grilles clear, noting unusual noise or smells and logging filter changes. Cleaning inside ducts and units is specialist work.
When your team notices a problem between visits, like drips, unusual noise, smells or damaged filters, they should report it rather than try to fix it. We can diagnose it and quote.
What the work involves, part by part
Filters
Dirty filters cut airflow and let dirt slip past their frames. We clean the frames and rails so the filters sit tight.
Heating and cooling coils
Dirt on a coil slows the air and makes it harder for the coil to heat or cool. Cleaning restores the open path through the fins.
How the visit works
Protection comes first: floors, worktops and anything near the work are covered. Then we make the system safe and start. The work on site takes from a few hours for a compact unit to a day or more for a large one, and the area is cleaned down before we leave. Seeing the system in pictures first means the trip to Charleshill can be planned properly.
- We start with a survey of the unit and a fixed quote for the work.
- 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.
- Drain trays are cleared and cleaned and the outlet checked.
- We close up the unit and send the certificate and before and after photos.
Getting ready for the visit
- Clear the space around the work
- Name a contact who can let us in at the agreed time
- Let us know about parking and loading
Get a fixed quote
Getting a quote doesn’t take long. Send a few details and photos, and we normally reply with a fixed quote within one working day. If we need to see the system first, we book a survey around your hours.
Read more
Keeping the system healthy
How long the results last depends on use and care. We suggest:
- Plan the next inspection before the last report gets filed away
- Make sure the unit’s access doors open easily
- Note any water around the unit or leaks below it
- Clear leaves and litter away from the intake
The ducts served by the unit may need attention too. A clean unit feeding dirty ducts only solves half the problem, and we can quote for both.
Change or clean filters on time. Once filters clog, dirt starts getting past them.
How we price AHU cleaning
Every site gets its own quote. These are the things that affect it:
- The times the site is available
- Any permits to work or inductions
- Access, including roofs, risers and ceiling voids
- Whether several sites go on one quote
We don’t list prices on the website, because the cost depends on the site in front of us. Call for a fixed quote, and we will explain what it covers.
Asking for a quote
Photos and a few facts are often enough to price the work. Send what you can of the following:
- Problems your staff have spotted
- The paperwork from the last visit, if you have it
- The roof, plant room or outside wall the system runs to
- Any access panels or hatches you can see
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. Add the site type and your opening hours, and we can price many jobs without a visit.