Air handling units (AHU) in Merseyside

An air handling unit (AHU) is the central plant that filters, moves and often heats, cools or recovers heat from the air for a building's ventilation system. We replace ageing units, upgrade fans and controls, and service AHUs so they keep delivering their design airflows.

Across Merseyside the job is priced the same way wherever you are: what is fitted, how long it takes and how far we travel. Towns we cover include St Helens, Southport, Wallasey, Bootle and Bebington.

Air handling units in Merseyside at a glance

Area: Merseyside
Towns listed: 38, largest Liverpool
Postcode districts: CH60, CH61, L29, L30, WA2 and WA3
Price region: North West
Survey: Free survey (UK mainland)

What the work involves

Many AHUs in older offices, schools and retail units run on belt-driven fans, clogged filters and controls nobody understands. Replacing the fan section with EC fans, or the whole unit with a modern heat recovery AHU, can cut running costs and noise while restoring airflow. New units must meet current ecodesign rules for fan efficiency and heat recovery.

Like-for-like replacement

New unit in the same position, connected to existing ductwork.

EC fan retrofit

Belt-driven fans replaced with direct-drive EC fans.

Controls upgrade

New controls, sensors and BMS integration.

Guide prices in Merseyside

Air handling units (AHU) guide prices in Merseyside
Work	Guide price
Air handling unit replacement, small to medium unit, like-for-like position (per unit)	£9,450–£33,200 + VAT
Air handling unit service: filters, belts or EC fan check, coils, controls (per unit per visit)	£185–£375 + VAT

These ranges use our North West rates. Prices exclude VAT. You get a fixed written price before any work is booked.

Signs it is time to call us

Noisy plant rooms or rooftop units
Filters that are never changed
Corroded casings or leaking drain trays

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). Employers have a separate duty under the Workplace Regulations 1992 to provide effective and suitable ventilation.

How the job runs

Survey
Options
Plan
Install
Commission

Towns we cover in Merseyside

Questions about air handling units (AHU) in Merseyside

Is the survey free in Merseyside?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.

How often should an AHU be serviced?

Most AHUs need servicing at least twice a year, with filters changed more often in dirty environments. SFG20 schedules are commonly used to set frequencies.

Is it worth replacing belt-driven fans with EC fans?

Often yes. EC fans are usually more efficient, quieter and need no belt changes, and the retrofit can cost much less than a new unit.

Which rules apply to ventilation in Merseyside?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Which towns in Merseyside do you cover?

All of Merseyside, including St Helens, Southport, Wallasey, Bootle and Bebington. If your town is not listed, send the postcode and we will confirm.