Commercial · Nationwide

Commercial AC Installation

Commercial AC installation for UK offices, retail units, hospitality venues and industrial sites — from a two-cassette shop unit to a 500 kW VRF platform serving a multi-storey headquarters. Designed to CIBSE Guide A, installed to BS EN 378, commissioned to BSRIA BG 49.

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From: £3,200 per zone
Timeline: 3 days per floor typical, 6–8 weeks full building
Warranty: 5 years parts & labour

Why choose this

CIBSE Guide A heat-load design — not watts-per-m² guessing
BMS integration via Modbus, BACnet or KNX gateways
Out-of-hours working with 10–20% transparent uplift
F-Gas record-keeping and statutory leak testing built in
Cat A / Cat B / Cat B+ delivery for landlord and tenant fit-outs

What's included

Heat-load design and equipment schedule to CIBSE Guide A
VRF, Hybrid VRF, cassette or ducted architecture
Roof or plant-deck condenser positioning with structural sign-off
BMS integration and controls commissioning
Fire-stopping through compartment walls and floors
BSRIA BG 49 commissioning, O&M manuals and asset register

Who this commercial ac installation service is for

We deliver commercial ac installation for landlords, tenants, main contractors, fit-out firms, retail estates, hotel groups and light-industrial operators. Typical projects sit in the 10 kW single-tenant retail through to 500 kW+ multi-storey VRF 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

For a single-tenant unit or small office we default to 4-way ceiling cassettes fed by one outdoor condenser — simple, discreet and Cat A-ready. For anything above three floors or 100 kW total we specify VRF or Hybrid VRF: one condenser array handles 20+ indoor units with independent per-zone setpoints and heat-recovery between zones that need cooling and zones that need heating. Ducted concealed-ceiling units are the default for hotels and premium retail where visible indoor equipment is not acceptable.

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

Commercial AC Installation typically starts at £3,200 per zone 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 3 days per floor typical, 6–8 weeks full building. We quote fixed prices — nothing is added on site without written change control.

A 25 kW office cassette system running 10 hours a day, 5 days a week uses around 4,000 kWh a month (£1,200 at 30 p/kWh). Migrating from a 15-year-old R-410A system to R-32 VRF with occupancy-linked control typically cuts that by 35–45%. BMS integration adds a further 5–10% through better setpoint discipline and out-of-hours setback. 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

For commercial VRF we split the specification between Daikin VRV 5, Mitsubishi Electric City Multi (and Hybrid VRF for heat-recovery applications) and Toshiba SMMSe. Cassettes and ducted units follow the same brand family for warranty consistency. Where value engineering is a hard constraint we specify Mitsubishi Heavy Industries KX-Z or Midea V6 — both deliver credible performance at a lower capital cost.

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.

Cat A, Cat B and Cat B+ commercial fit-outs

For landlord Cat A hand-back we deliver the base-build system (condensers, main pipework, cassettes on a regular grid, main controllers) certified and warranted for reconfiguration by an incoming tenant. Cat B tenant fit-out picks up the Cat A system and reconfigures indoor unit positions, adds VAV/VRV branch controllers where meeting-room densities have shifted and rebalances the commissioning. Cat B+ typically adds displacement ventilation, upgraded air quality filtration (F7 or ePM1) and heat-recovery ventilation integration.

We deliver all three under a single accountable engineering team, which matters because the failure mode on multi-contractor fit-outs is always the commissioning boundary — the Cat A team blames the Cat B team, both blame the BMS integrator, the tenant lives with poor comfort for a year. Single-team delivery means one commissioning report, one warranty and one accountable engineer if performance drifts.

MEES, EPC ratings and R-410A phase-out

From April 2027 commercial properties in England and Wales must hold an EPC rating of C or better to be legally lettable. Air conditioning changes score directly against the EPC calculation — replacing R-410A splits with modern R-32 VRF typically lifts a building by one full band. Our EPC modelling service (using approved SBEM software) tells you before you commit what the post-install rating will be.

R-410A itself is phasing out under the F-Gas Regulation — new equipment production ends in 2025 for most classes, and top-up refrigerant is already scarce and expensive. Any commercial site still running R-410A should be planning a migration to R-32 or R-454B within the next 3–5 years. We produce phased migration plans that spread capital cost across financial years while maintaining full operational capacity throughout.

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 commercial ac installation cost?＋

Fully-fitted prices start at £3,200 per zone. 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?＋

3 days per floor typical, 6–8 weeks full building

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.

Can you work overnight or at weekends in occupied buildings?＋

Yes — evening slots (18:00–02:00), Sunday shutdowns and phased delivery are standard. Out-of-hours working carries a transparent 10–20% uplift itemised at quotation.

Do you integrate with our BMS?＋

Yes — Modbus RTU/TCP, BACnet MS/TP or IP, KNX and Trend IQ4 integration are all standard. We supply the gateway hardware and commissioning graphics as part of the works.