Air handling units
Servicing, filter changes, repairs and replacement of AHUs. Priced before we book, with a written report after.
- Visit price agreed before we book
- Written report after every visit
- F-gas records updated where required
What is an air handling unit?
An air handling unit (AHU) is a large central unit that filters, heats, cools and moves air through a building's ductwork, often with heat recovery. AHUs serve offices, schools, hospitals and retail units and need regular filter changes, belt or motor checks, coil cleaning and damper and control checks.
In the UK, expect around £245–£595 per unit, per visit, plus VAT. A typical job (AHU service with filter change) is £245–£595 plus VAT.
An AHU is the lungs of a building. When filters clog, belts slip or coils foul, air flow drops, energy use rises and occupants notice stale air and poor temperatures.
We service AHUs on a planned basis, carry out repairs and fan upgrades, and replace units at the end of their life — including the craneage, ductwork connections and controls that a replacement involves.
Where it suits
- Office buildings
- Schools and colleges
- Healthcare premises
- Retail and leisure
- Hotels
- Industrial and laboratory buildings
What is included
- Filter changes to the specified grade
- Fan, belt and motor checks
- Coil and drip tray cleaning
- Damper and actuator checks
- Heat recovery device checks
- Repairs, upgrades and full replacement
How a visit is carried out
Inspect
We record the AHU type, condition, filter grades and controls.
Service
Filters are changed and components cleaned and checked.
Report
Readings and recommendations are reported.
Upgrade or replace
Where needed, we quote for fan upgrades or replacement.
Air handling units prices
National guide prices for 2026. Local pages show prices adjusted for each region.
| Item | Guide price (ex VAT) | Inc VAT | Basis |
|---|---|---|---|
| AHU service with filter change | £245–£595 | £294–£714 | per visit |
| Fan / motor replacement | £1,450–£4,950 | £1,740–£5,940 | per fan |
| Full AHU replacement | £14,950–£69,500 | £17,940–£83,400 | per unit |
Ex VAT. Filters are charged at cost for the grade specified.
Replacement prices depend heavily on size, access and craneage.
Typical job: AHU service with filter change — £245–£595 plus VAT.
Things to plan for
Filters
Filter grades should match the original design or current guidance for the building.
Energy
Fan upgrades and better controls can cut energy use significantly on older units.
Replacement logistics
Large AHU replacements need craneage, road closures and careful programming.
Hygiene
Drip trays and coils must be kept clean to avoid biological growth.
Questions about air handling units
How often should an AHU be serviced?
Typically every three to six months, depending on use and filter loading.
How long do air handling units last?
Commonly 20 years or more with good maintenance, though fans and controls may need replacing sooner.
Can you upgrade old AHU fans?
Yes. EC fan upgrades are a common way to cut energy use without replacing the whole unit.
Do you handle crane lifts?
Yes, we plan craneage, permits and lifting for replacements.
Premises we fit this for
Air handling units near you
Choose your county or region for local guide prices and the towns we cover.
England
- Bedfordshire
- Berkshire
- Bristol
- Buckinghamshire
- Cambridgeshire
- Cheshire
- Cornwall
- County Durham
- Cumbria
- Derbyshire
- Devon
- Dorset
- East Riding of Yorkshire
- East Sussex
- Essex
- Gloucestershire
- Greater Manchester
- Hampshire
- Herefordshire
- Hertfordshire
- Isle of Wight
- Kent
- Lancashire
- Leicestershire
- Lincolnshire
- London
- Merseyside
- Norfolk
- North Yorkshire
- Northamptonshire
- Northumberland
- Nottinghamshire
- Oxfordshire
- Rutland
- Shropshire
- Somerset
- South Yorkshire
- Staffordshire
- Suffolk
- Surrey
- Tyne and Wear
- Warwickshire
- West Midlands
- West Sussex
- West Yorkshire
- Wiltshire
- Worcestershire
Scotland
What happens next
Tell us what you need
Use the form, the quote tool, live chat or call us. A postcode and the type of premises is enough to start.
Survey or visit
For mainland installations we survey free of charge. Service and repair visits, and travel to remote locations, are priced before we book.
Written quote
You get the specification, the price and the programme in writing, including any landlord or planning points.
Work and handover
We install, service or repair around your hours, then hand over the commissioning and F-gas records.
Tell us about your premises
Send a few details and we will arrange a survey or call you back with a guide price.