HVAC · Air Handling

Air Handling Unit (AHU) Installation

Air handling unit (AHU) installation across the UK — custom-built and packaged AHUs with heat recovery, filtration and inverter-driven EC fans for commercial and industrial ventilation.

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From: £15,000 per AHU
Timeline: 5–15 days including ductwork tie-ins
Warranty: 5 years parts & labour

Why choose this

Heat recovery efficiencies of 75–90%
EC inverter fans for demand-linked airflow
HEPA filtration options for cleanroom applications
SFP compliance for Part L Building Regulations

What's included

Heat-load design to CIBSE Guide A
Ceiling cassette, ducted or VRF architecture
Roof/plant-deck condenser positioning
Fire-stopping through compartment walls
BSRIA BG 49 commissioning and handover pack

Who this air handling unit (ahu) installation service is for

We deliver air handling unit (ahu) installation for commercial fit-outs, industrial sites, healthcare estates, education and mixed-use developments. Typical projects sit in the 1,000 m³/h to 50,000 m³/h supply air band, and every scheme is designed by an F-Gas certified engineer against a full CIBSE Guide A heat-load calculation — never a rule-of-thumb watts-per-square-metre guess.

We cover the whole UK from London-based engineering hubs, with same-week surveys inside the M25 and 7–14 day lead times nationally. All work is delivered by directly-employed engineers rather than subcontractors, so the person who quotes your job is accountable for how it is installed and commissioned.

System types we recommend

Modern AHUs are almost universally counter-flow or rotary heat-recovery units (75–90% thermal efficiency) with EC inverter fans. We specify M5 or F7 filtration for standard applications and step up to HEPA H13/H14 for cleanroom and healthcare. Direct-expansion cooling coils are the norm below 100 kW; chilled-water coils above.

Every specification is written against your actual building fabric, occupancy pattern and electrical capacity. We do not resell a single manufacturer — the design drives the equipment choice, not the other way around. If your incoming supply is constrained, we flag it at survey and offer a phased approach or a load-shedding controller rather than pretending the problem does not exist.

The survey, design and installation programme

A senior engineer attends site within 3–5 working days of enquiry. The survey covers heat gains (fabric, solar, occupancy, equipment), electrical capacity, condenser positioning, structural loading, acoustic constraints to neighbours, drainage routes and any planning/landlord constraints. Photos, measurements and load calculations feed into a written fixed-price proposal within 48 hours.

Once awarded, we produce a full drawing pack — pipe routes, electrical schedule, condenser structural loading, refrigerant volume and BS EN 378 risk assessment. Installation runs to a published programme with daily photo updates. Commissioning follows BSRIA BG 49 with a full test-and-balance report, an F-Gas record and manufacturer warranty registration on the day of handover.

Costs, timeline and running expenses

Air Handling Unit (AHU) Installation typically starts at £15,000 per AHU for a compact single-zone scheme. Multi-zone and specialist projects scale with equipment tonnage, condenser positioning complexity and any out-of-hours working requirement. Programme duration is 5–15 days including ductwork tie-ins. We quote fixed prices — nothing is added on site without written change control.

A 10,000 m³/h AHU with 85%-efficient heat recovery and EC fans uses 60–90% less energy than a legacy AC-fan AHU without recovery. Payback on retrofit is typically 3–5 years. Modern R-32 inverter equipment routinely delivers seasonal efficiency ratings (SEER) between 6.5 and 8.5, which is 30–50% better than the R-410A systems installed a decade ago. On heat-pump duty, coefficients of performance (COP) sit between 3.5 and 4.5 in UK conditions — comfortably ahead of gas heating on marginal-cost pence-per-kWh once carbon pricing is factored in.

Compliance, warranties and aftercare

Every installation is notified under Building Regulations Part P (electrical) and Part L (energy) where applicable, and lodged with the appropriate competent-person scheme. Systems containing 5 tCO₂e or more of F-Gas refrigerant require statutory annual leak checks under Regulation EC 517/2014 — we hold the F-Gas company certificate and can act as your Responsible Person, keeping records for HMRC and Environment Agency inspection.

Equipment carries a 5-year manufacturer parts warranty (compressor included) when installed by an accredited engineer. We register the warranty on the commissioning day so there is nothing for you to file. Our installation workmanship carries a 12-month cover-all warranty, and PPM service plans start at £110 per outdoor unit per year — sufficient to preserve manufacturer cover and catch drift before it becomes downtime.

Brands we install and why

Barcol-Air, VES, FläktGroup, Systemair and Trox for packaged AHUs; site-assembled from Vent-Axia or Nuaire for tight-spec projects.

All refrigerant work uses R-32 (GWP 675) as standard, with R-454B (GWP 466) available on request for future-proofing against the F-Gas phase-down schedule. We steer clients away from R-410A (GWP 2088) for any new install — the refrigerant is being progressively withdrawn from supply and top-up costs will rise sharply between 2026 and 2030.

Working around your operation

Downtime is the hidden cost of any air conditioning project. We routinely deliver work in evening slots (18:00–02:00), Sunday shutdowns and staged week-by-week phasing so your day-to-day operation continues unaffected. Overnight and weekend working commands a modest 10–20% uplift which we itemise transparently at quotation.

Dust management, negative-pressure containment and daily photo close-out reports are standard for any works in occupied premises. Where a phased approach is chosen, we deliver temporary cooling (portable spot coolers or hire chillers) to bridge critical zones during the transition — priced separately so you can choose whether the resilience is worth the line item.

Why choose us for this work

We are F-Gas certified installers with directly-employed engineers, fully insured to £10m public liability and £5m professional indemnity. Every project comes with a fixed price, a written programme, a photo record and a 5-year warranty on equipment plus 12 months on workmanship. We publish real client references on request — not gated behind a form.

Request a quote online and we will book a site survey. Same-week surveys inside the M25, 7–14 day lead times nationally, and a qualified engineer attending the survey rather than a scripted call-centre operator.

Frequently asked questions

How much does air handling unit (ahu) installation cost?＋

Fully-fitted prices start at £15,000 per AHU. Multi-zone and specialist projects scale with equipment tonnage and installation complexity. All quotes are fixed price — no on-site supplements.

How long does the installation take?＋

5–15 days including ductwork tie-ins

Do you handle Building Regulations sign-off?＋

Yes. Part P electrical work is notified via our NAPIT/NICEIC scheme and Part L energy compliance is documented in the commissioning pack. You receive certificates on the day of handover.

What refrigerant do you use?＋

R-32 as standard (GWP 675). R-454B (GWP 466) is available on request for maximum future-proofing against F-Gas phase-down. We do not install R-410A for new schemes.

Do you offer service and maintenance plans?＋

Yes — PPM plans start at £110 per outdoor unit per year and include filter cleans, coil disinfection, drain-line flush, refrigerant pressure check and electrical inspection. Statutory F-Gas leak checks are included on qualifying systems.

What warranty applies?＋

5-year manufacturer parts warranty on equipment (compressor included) plus 12 months workmanship warranty on our installation. Annual servicing preserves manufacturer cover.