Air handling units (AHU) in Hampshire

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 Hampshire 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 Eastleigh, Winchester, Southampton, Portsmouth and Basingstoke.

Air handling units in Hampshire at a glance

Area: Hampshire
Towns listed: 34, largest Southampton
Postcode districts: SO18, SO19, SO18, SO50, SO16 and SO51
Price region: South East
Survey: Free survey (UK mainland)

What air handling units (AHU) involves

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. Replacements often involve crane lifts, roof work and out-of-hours changeovers.

EC fan retrofit

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

Controls upgrade

New controls, sensors and BMS integration.

Planned servicing

Filters, belts, coils, drains and controls on a schedule.

Guide prices in Hampshire

Air handling units (AHU) guide prices in Hampshire
Work	Guide price
Air handling unit replacement, small to medium unit, like-for-like position (per unit)	£10,950–£38,450 + VAT
Air handling unit service: filters, belts or EC fan check, coils, controls (per unit per visit)	£215–£435 + VAT

Guide prices using South East rates. Prices exclude VAT. A guide price is not a quote: we confirm a fixed price in writing first.

When to get it looked at

Rising energy bills from old plant
Frequent belt or fan failures
Noisy plant rooms or rooftop units

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 Hampshire

Questions about air handling units (AHU) in Hampshire

Which towns in Hampshire do you cover?

All of Hampshire, including Eastleigh, Winchester, Southampton, Portsmouth and Basingstoke. If your town is not listed, send the postcode and we will confirm.

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.

Are prices different in Hampshire?

Our guide prices are adjusted by region. In Hampshire we use South East rates, so air handling unit replacement, small to medium unit, like-for-like position is typically £10,950 to £38,450 + VAT per unit.

Is the survey free in Hampshire?

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.