Hampshire · Air handling unit cleaning
Air handling unit cleaning in South Wonston, Hampshire
Cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces for commercial sites in South Wonston and across Hampshire. BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease.
- Dirty filters cutting the airflow
- Stale or musty smells from the ventilation
- Coils clogged with dust and debris
FAQs for South Wonston
Can you get to a site in South Wonston?
Yes, South Wonston is part of our area, however small the site. The journey is planned ahead, so a few details about the route help.
Do you work overnight in South Wonston?
Yes. We work evenings, overnight and at weekends. The work in South Wonston can fit around your hours. Just phone us on 0345 646 2711 or email us with your opening times and we will plan around them.
Can you quote from pictures?
Yes, where the photos show enough. Otherwise, we book a survey at a time that suits the site, and the quote follows that.
What should I send you?
Some photos and a quick description of the system plus the address and your hours. If we need more, we will ask.
When should our AHU next be cleaned?
Inspection under TR19® Air decides it. Units in heavy use or in sensitive buildings may need attention more often.
How far ahead should we book?
For planned work, earlier is better, especially if the next clean or test is due soon. For emergencies, we take calls 24/7.
What does TR19 mean?
TR19® is the BESA specification for keeping ventilation systems clean. Since 2019, TR19® Grease has been a standalone specification for grease in kitchen extract systems, and TR19® Air covers general supply and extract systems.
Do you survey before quoting?
Yes, every time. Diagnosis comes before treatment: the survey tells us what the system needs and how to reach it and the fixed quote is built on it.
AHU cleaning in South Wonston, done properly
Units vary a lot in size, age and layout, whether it’s a compact unit in a ceiling void or a big unit on the roof. Every job starts with a survey, from photos or on site, followed by a fixed quote, so you know where you stand. Typical jobs include odours coming through the supply air and drain trays holding standing water, across filter sections, heating and cooling coils and internal panels.
In a village or hamlet like South Wonston, few buildings have mechanical ventilation, but where it’s fitted, it needs the same inspection and cleaning as anywhere.
We’re CHAS and SafeContractor accredited, we hold ISO 9001 and we’re fully insured. We are also a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, trading since 2009.
- Location
- South Wonston (SO21)
- Region
- Hampshire
- Records
- Photo report after each visit
- Quote
- A fixed quote up front
- Hours
- After hours by arrangement; emergencies any time
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
What affects the cost of AHU cleaning
The survey tells us what the work involves. The main factors are:
- When the work can happen, such as evenings, overnight or weekends
- The condition we find in the survey
- Where the site is and how we reach it
- How many systems or sites are involved
Leaving it longer rarely makes the work cheaper. Build-up, wear and faults tend to get worse, not better, which can make the next visit longer. If you’re unsure, call 0345 646 2711 or send us an email and we will give you an honest view and a fixed quote.
What we need to know
You do not need the technical terms. It helps if you can send:
- Problems your staff have spotted
- Any previous report or certificate
- Any access panels or hatches you can see
- When the site is open and when it’s quiet
If you need AHU cleaning in South Wonston, call us on 0345 646 2711 or send us an email. Let us know the site type and the opening hours, plus photos or the previous report if they’re to hand. We usually send a fixed quote within one working day.
Do you need AHU cleaning in South Wonston?
Cooling coils create condensation, and that water has to go somewhere. A blocked outlet or a badly sloped tray leaves standing water, and that’s where slime and odours start.
The symptoms we’re asked about most are:
- Debris and leaves in the fresh air intake
- Fan sections that haven’t been cleaned in years
- Air handling units due a clean after building work
- Odours coming through the supply air
Royal Hampshire County Hospital, about 4 miles south, is the nearest hospital to South Wonston, and healthcare sites of every size need their supply air kept clean.
What your quote should include
- Whether the price is fixed
- What paperwork you get at the end
- What hours they’ll be on site
- How they set the interval to the next visit
What AHU cleaning looks like in South Wonston
We cover South Wonston, about 59 miles from central London, as part of our work across London and the South East. Visits are booked around your hours, evenings and weekends included. For South Wonston, the closest hospital is Royal Hampshire County Hospital, roughly 4 miles south. If you run a surgery, clinic or care home, your ventilation deserves the same care as a hospital’s, on a smaller scale.
School buildings such as South Wonston Primary School are normally done in the holidays, so classrooms are not disturbed.
South Wonston is about 4 miles north of Winchester, in Hampshire. South Wonston gets the same approach as every site we work on: a survey first, a fixed quote, work timed around your hours and a report with photos. Our Hampshire coverage runs to 683 places, South Wonston among them. You can also see our page for Southampton, about 14 miles away.
Postcode districts we cover here for AHU cleaning: SO21. Whether your site is on Norris Gardens, Wrights Way and Lovell Close or a nearby road, our technicians can take on the work. Nearby, we also carry out AHU cleaning in Worthy Down (1 mile south), Springvale (2 miles south-east), Sutton Scotney (2 miles north), Stoke Charity (2 miles north-east) and Hunton (3 miles north). Further out, we also cover Basingstoke (14 miles north-east), Winchester (4 miles south), Eastleigh (11 miles south), Andover (9 miles north-west), Chandler's Ford (10 miles south) and Alton (15 miles east).
Near you in South Wonston
The nearest railway station is Winchester station, roughly 3.7 miles south of the centre. Other landmarks nearby include Royal Hampshire County Hospital (4 miles south) and Winchester Castle (4.1 miles south). Green spaces nearby include Winnall Moors.
Also near South Wonston
What else we do in South Wonston
How the visit works
On the day, we arrive at the time agreed with you, often in the evening, overnight or at the weekend so the site keeps working. 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. The work itself takes a single shift for a typical unit, longer for large or heavily soiled ones. Visits to a village like South Wonston are booked in advance, at a time that suits whoever runs the site.
- We survey the unit from pictures 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, coils, fan section and casing are cleaned in turn.
- Standing water and slime come out of the tray and the drain is checked.
- We close up the unit and send the certificate and before and after photos.
How to prepare
- Mention any locked doors, roof access or ceiling voids
- Name a contact who can let us in at the agreed time
- Have your last certificate or report to hand
Ask for a quote
Quoting starts with a diagnosis, from your photos and details or, where that is not enough, a survey on site. Then we send a fixed price, before work begins.
Related advice
In-house cleaning or a specialist?
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 will take a look and send you a fixed quote.
Staff cleaning does not replace a specialist visit; it supports it. Clean filters and tidy surfaces slow the build-up, but the parts you can’t see still need a specialist at the right interval.
Why act early in South Wonston
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. It’s simpler to plan the work at South Wonston now than to arrange it in a hurry later.
Working hours, access and the scale of the site all affect the cost. Each of those is built into the quote, and the price is fixed before any work starts.
Why book with us
- Fully insured
- CHAS and SafeContractor accredited, with ISO 9001
- Out-of-hours work and a 24/7 emergency line
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
Read our cost guide and our accreditations and certificates.
Keeping the system healthy
Results last longer with the right care. Here’s what we suggest:
- Do not store bins or materials near the intake
- Check the drain tray is emptying during routine visits
- Report stiff or damaged access doors
- Plan the next inspection before the last report gets filed away
The ducts served by the unit may need attention too. A clean unit feeding dirty ducts only solves half the problem, and we can survey both.
Make the drain tray part of every maintenance visit. A drain that is cleared early never gets to the slime stage.
What AHU cleaning cannot fix
In fairness, some problems need a different fix:
- Controls and BMS settings that run the unit
- Damaged coils beyond cleaning
- Dirty ducts beyond the unit itself
Not sure which it is? You can call us on 0345 646 2711 or email us and we’ll tell you honestly.
Where we work
- Heating and cooling coils
- Internal panels
- Dampers and louvres
- Supply and extract fans
- Drain trays
- Filter sections