Portsmouth · Air handling unit cleaning
AHU Cleaning in Cosham
Air handling unit cleaning for Cosham, with a survey first and a report with photos at the end. Ask us for a fixed quote.
- Coils clogged with dust and debris
- Odours coming through the supply air
- Debris and leaves in the fresh air intake
Why act early in Cosham
Cleaning a unit while it only has light dust is quick. Leave it for years and dirt bakes onto coils and casings, particularly where damp has made it stick. It’s easy to lose track of when the work was last done on a quieter site.
Putting the work off seldom saves money. Problems in a system tend to grow, and a neglected system can mean more work. If you’re unsure, call 0345 646 2711, or send details by email for straight advice and a fixed quote.
Why choose Duct Doctor in Cosham
- Full insurance on every job
- Out-of-hours work and a 24/7 emergency line
- Survey first, then a fixed quote
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
Read how cleaning jobs are priced and our accreditations and certificates.
AHU cleaning for kitchens and businesses in Cosham
No two plant rooms are the same, whether it’s a compact unit in a ceiling void or a big unit on the roof. We look at the unit first, from photos or a site visit, and send you a fixed quote before any cleaning starts. If you are dealing with dust built up on fan impellers and dirty filters cutting the airflow, we can help.
In a smaller place like Cosham, buildings with ducted ventilation are more likely to be a school, a surgery, a care home or a small business unit than an office block. Smaller systems still gather dust and need inspecting.
Each visit ends with a written report and photos, so you have a record of what was done and when. Kitchen extract cleaning to TR19® Grease is certificated through the BESCA Vent Hygiene Elite portal.
- Place
- Cosham (PO6, PO3, PO2)
- Region
- Portsmouth
- Paperwork
- Photo report after every visit
- Quotes
- A fixed quote up front
- Working hours
- When your site is closed, plus a 24/7 line
- Telephone
- 0345 646 2711
- Checked
- 30 October 2026
Ventilation in Cosham buildings
Going by the FSA’s register, there are about 18 schools, colleges and universities, about 32 care, childcare and hospital premises and about 6 hotels, B&Bs and guest houses serving food within about 1.5 miles of central Cosham. Classrooms, bedrooms and care spaces are often served by ducted air, and that ductwork collects dust over time. For Cosham, the closest hospital is Queen Alexandra Hospital, roughly 0.6 miles north. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients.
For workplaces around Cosham station with mechanical ventilation, cleaning can be done in the evening or at weekends. Hospitals such as Queen Alexandra Hospital (about 0.6 miles north) show how much a building can rely on clean ventilation, and smaller healthcare sites near Cosham are no different. Classrooms and halls at schools such as Court Lane Junior Academy are easiest to work in when pupils are away.
Cosham is about 2 miles south-west of Purbrook, in Portsmouth. We provide AHU cleaning for businesses, landlords and public buildings in Cosham and the rest of Portsmouth. Cosham is one of 19 places in Portsmouth where we work for commercial clients.
All of PO6, PO3 and PO2 is within our area for AHU cleaning, from busy streets to back roads. If you need AHU cleaning at premises on Dean Road, Park Lane and Elgin Road or anywhere close by, we can help. Cosham sits on or near the A397, which makes travel easy for AHU cleaning. Nearby, we also carry out AHU cleaning in Wymering (1 mile north-west), Hilsea (1 mile south), Drayton (1 mile east), Widley (1 mile north-east) and Paulsgrove (1 mile west). We also work in nearby towns such as Southsea (4 miles south), Milton (3 miles south), Landport (3 miles south), Portsea (3 miles south-west), Portsmouth Point (4 miles south-west) and Fratton (3 miles south).
Landmarks near Cosham
Around Cosham, our work takes us to kitchens and buildings near The First Post pub, Alexandra Park and Springfield School. There’s a railway station in Cosham itself: Cosham station. Well-known places in the area include Tricorn Centre (2.9 miles south) and World War I Remembrance Centre (1 mile south-east). For a walk, there’s Southmoor Nature Reserve and Portsdown Hill.
Common questions in Cosham
Can the work in Cosham be done at night or at weekends?
Yes. We work evenings, overnight and at weekends. The site is handed back ready to open. Let us know the hours you’re closed and we’ll book within them.
Can a school’s ventilation in Cosham be done out of term time?
Yes. The holidays are the usual time for school work. Food Standards Agency records list about 18 schools, colleges and universities with registered kitchens within about a mile and a half of Cosham. You can give us a ring on 0345 646 2711 or drop us a line with the dates the site is empty.
What about areas you can’t get to?
They’re marked on the report. Often the fix is extra access, such as new panels in ductwork, which we can install.
Is Cosham in your area?
Yes. We cover Cosham and across Portsmouth, within our South East and London area. For a fixed quote, call 0345 646 2711 or send us an email.
Do you have a 24/7 line?
Yes, 24/7. Office hours are Monday to Friday, 8am to 6pm, with the emergency line covering every other hour.
Are you accredited?
Our accreditations are CHAS, SafeContractor and ISO 9001, alongside BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease. The Vent Hygiene Elite scheme is run by BESCA and audited independently.
Is there a survey before the work?
Yes. Photos often do the job, and larger or hidden systems get a visit.
What is TR19?
It’s BESA’s specification and the benchmark insurers, fire officers and EHOs look to. It covers how systems are inspected, cleaned and checked, and it takes a risk-based approach.
The process
We start by comparing what we find with the survey or your pictures. Anything unexpected is raised with you before we go further. After that, the work takes from a few hours for a compact unit to a day or more for a large one. For a site near Cosham, the work is booked around your opening hours, evenings and weekends included.
- The survey covers the unit, its access and how it can be shut down.
- The area is protected and the unit made safe.
- Each section is cleaned of dust, debris and slime.
- We clean the coils and clear the tray and drain.
- We close every panel, hand the unit back and send the report and certificate.
Preparing for the visit
- Arrange a key holder or contact on site
- Plan for cooking equipment or plant to be off before we arrive
- Tell us about access, such as roof hatches, plant rooms, ceilings or locked areas
Get a fixed quote
The quickest way to a quote is to send photos: the system from a couple of angles, plus any access panels or hatches. Add the site type and your opening hours, and we can price many jobs without a visit.
Related advice
Towns and villages near Cosham
Other services in Cosham
Looking after it afterwards
After the visit, a few habits help the work last:
- Report musty smells from the vents straight away
- Note any water around the unit or leaks below it
- Stick to the filter change plan
- Do not store bins or materials near the intake
When we’ve closed the unit up, it can be restarted with your site team. Keep an eye on the condensate drain over the next few days to confirm water is draining away.
Have the unit inspected regularly, in line with the risk-based approach of TR19® Air instead of leaving it to guesswork.
How we price AHU cleaning
A fixed price needs a few facts first. We check:
- Where the site is and how we reach it
- The size of the system
- Whether it’s a one-off visit or part of a schedule
- Site requirements such as sign-in and permits
The cost depends on how big the system is, what state it’s in and access to every part of it. We give you a fixed price before work begins, so you know where you stand.
Helping us quote
There’s no need for technical detail. It helps if you can send:
- Your last certificate, test record or report
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- Photos showing the whole system and its surroundings
To get a fixed quote, call us on 0345 646 2711 or use the quote form and tell us the type of site, your opening hours and roughly what the system looks like. Photos and the last report, if you have one, make the quote quicker. You’ll usually have a quote within one working day.
Staff cleaning versus specialist work
A few tasks are always specialist work: entering ducts, working on fans, testing dampers and taking grease readings need training, the right equipment and safe access. Leave those to us.
Keep a record of what your team does. A dated log of in-house cleaning and checks shows an inspector that the system is looked after between visits, next to our reports.
For landlords and multi-site operators
We work for landlords, managing agents and facilities managers as well as the people running the site. 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.
From a single site to a large estate, the standard is the same: a survey first, a fixed quote, the work timed around the site and a report with pictures.
What AHU cleaning cannot fix
Not every problem is solved by AHU cleaning, and we will tell you before we start. It will not put right:
- Ductwork downstream of the unit, which is a separate clean
- Airflow problems caused by the system’s design
- Controls and BMS settings that run the unit
Not sure which it is? You can call us on 0345 646 2711, or send details by email and we will tell you honestly.
What the work covers
- Filter sections
- Drain trays
- Dampers and louvres
- Internal panels
- Heating and cooling coils
- Supply and extract fans