What Drives Commercial HVAC Costs: A Buyer’s Breakdown

“How much does commercial HVAC cost?” is the question every facilities manager needs answered before a board conversation, and the one most supplier websites dodge with “it depends on your requirements.” It does depend — but that is not an excuse to give no numbers. This guide sets out honest UK price ranges by system type, explains what actually moves the price, and covers the funding that turns a large capital figure into a manageable one. It is the numbers-led starting point for planning any commercial heating, cooling and ventilation investment.

Key takeaway upfront

There is no single price for commercial HVAC because it is not one thing — VRF, chillers, air handling units, ventilation and heat pumps serve different duties at different scales. What every honest quote shares is that the price is driven by the building’s real heating and cooling load, the number of zones and units, plant-room and access constraints, refrigerant choice and any electrical supply upgrade — never by floor area alone. Any firm figure should come from a survey and a model of your real consumption, not a rule of thumb.

In this guide

• Indicative cost ranges by system
• VRF and VRV cost
• Chiller cost
• Air handling unit cost
• Ventilation and MVHR cost
• Commercial heat-pump cost
• Maintenance and PPM cost
• What actually drives the price
• Refurbish versus replace — the honest saving
• Funding that offsets the capital
• Frequently asked questions

Indicative cost ranges by system

These are indicative UK ranges for fully installed systems. They are wide because they span everything from a single office floor to a hospital campus — your figure lands within a range once the load and building are known.

System	Typical capacity	Indicative installed cost
VRF / VRV air conditioning	22–150 kW cooling	£400–£700 per kW installed
Central chiller / chilled water	100 kW–2 MW+ cooling	Priced from a design
Air handling units (AHUs)	fan 1–50 kW; 0.5–20 m³/s	Priced from a design
Ventilation / MVHR	fan 0.5–20 kW	Priced from a design
Commercial heat-pump heating	40–500 kW thermal	Priced from a design
Maintenance / PPM	across installed plant	£180–£350 per indoor unit per year

Treat these as planning figures. The rest of this guide explains where within each range a given building sits, and why.

VRF and VRV cost

One 2026 trade pricing guide quotes VRF/VRV at about £400–£700 per kW for a complete supply-and-install (a 40 kW system is £16,000–£28,000). A single-condenser office fit-out sits at the low end; a multi-floor building with dozens of indoor units and heat-recovery (three-pipe) VRF sits at the high end. The cost drivers are the number of indoor units, whether you specify heat recovery (which adds pipework and cost but recovers heat between zones), the condenser plant-deck works, and the controls or BMS integration. Our VRF and VRV air conditioning page covers the specification in detail, and the VRF versus chiller comparison helps decide whether VRF is the right medium at all. Split and cassette prices, and how they compare with VRF, are in the guide to air conditioning installation costs.

Chiller cost

Central chillers cover a very wide range, from a small air-cooled unit (published equipment-only list prices run from £2,349 at 5 kW to £13,520 at 63 kW ex VAT; see the chiller cost guide) to a multi-megawatt water-cooled installation for a hospital or data campus, which is priced from a design. The chiller itself is only part of the cost: pumps, headers, chilled-water pipework, buffer vessels and — for water-cooled systems — cooling towers with their L8 water-hygiene duties all add up. Free-cooling capability adds cost up front but cuts running cost hard on part-load. See commercial chillers and chilled-water systems for the plant-room detail.

Air handling unit cost

AHU cost depends on duty and construction: published equipment-only prices for compact heat-recovery units run from about £2,000 to £14,000 ex VAT (see the AHU cost guide), while a large built-up AHU with thermal-wheel heat recovery, high-efficiency EC fans and F7/ePM filtration for a hospital or lab is priced from a design. Ductwork, craneage and plant-room works add to the unit cost. Critically, an ageing AHU is often a refurbishment candidate rather than a replacement — see the refurbish-versus-replace section below and our air handling units and ductwork page.

Ventilation and MVHR cost

Ventilation and MVHR are priced from a design, depending on the airflow, the extent of ductwork and whether demand control (CO2 or occupancy sensing) is included. MVHR carries a higher unit cost than simple supply-and-extract but recovers up to around 90% of the heat in exhaust air, which pays back in reduced heating and cooling load — and it is what makes low-temperature heating from a heat pump viable. Our commercial ventilation and MVHR page sets out the indoor-air-quality-and-energy trade-off.

Commercial heat-pump cost

Commercial heat-pump heating is priced from a design. The heat pumps themselves are only part of it: emitter upgrades (to allow a low, efficient flow temperature), buffer vessels, controls and — often the biggest single variable — any DNO electrical supply upgrade. A supply upgrade can be the longest-lead and most expensive item, which is why it should be checked at feasibility. The heat pump versus gas boiler comparison and our commercial heat pumps page cover the running-cost side that offsets the capital.

Maintenance and PPM cost

A planned maintenance contract on split and cassette systems is quoted at about £180–£350 per indoor unit per year in one 2026 trade guide (two visits, labour and minor consumables, major parts excluded); larger sites with AHUs or BMS integration are priced on a survey, and the price also depends on the leak-check frequency it must satisfy. This is not an optional extra: it discharges your statutory F-Gas leak-check duty, protects manufacturer warranties and holds efficiency. Our planned versus reactive maintenance guide sets out why the contract usually costs less than the reactive call-outs it replaces.

What actually drives the price

Six factors move the figure more than anything else:

• Heating and cooling load. Cost tracks capacity, and capacity is set by the building’s real heat gains and losses — solar, occupancy, IT and process heat — not floor area.
• Number of zones and units. More indoor units, more control, more pipework and labour.
• Plant-room and access constraints. Craneage, restricted plant rooms and out-of-hours working in an occupied building all add cost.
• Refrigerant choice. Low-GWP plant future-proofs against the F-Gas phase-down but can carry different equipment and, for flammable naturals, siting cost.
• Electrical supply. Electrified cooling and heat pumps add load; a DNO upgrade is often the single biggest swing factor.
• Controls and BMS integration. Good controls cost more up front and pay back in running cost, because a building spends most of its hours below peak.

Callout — why “cost per square metre” misleads. Two buildings of identical floor area can differ by a factor of three in HVAC cost, because one is a lightly-loaded office and the other a heat-dense data suite. Always size on load, not area.

Refurbish versus replace — the honest saving

The genuine cost-saving angle most suppliers skip: an ageing AHU or chiller is frequently a refurbishment candidate, not a replacement. Retrofitting EC (electronically commutated) fans, replacing tired coils, adding or improving heat recovery and upgrading filtration can cut fan energy substantially and lift indoor air quality for a fraction of the cost — and disruption — of a full replacement. Replacement is the honest answer only where the casing is corroded, the layout is wrong, or the duty has changed. The right service is a whole-life-cost comparison of each option from a proper survey, not a default rip-out.

Funding that offsets the capital

The headline capital figure is not the whole story, because commercial HVAC is funded through the tax system. The £7,500 Boiler Upgrade Scheme is a flat grant towards air-source and ground-source heat pumps up to 45 kWth in homes and non-domestic buildings in England and Wales; it does not fund VRF, chillers or air handling units. Instead, the tax system carries it: the Annual Investment Allowance (100% on up to £1m a year) and, for companies, the 50% first-year allowance for special-rate assets — heating, ventilation and air-cooling plant is usually special-rate, so full expensing does not normally apply. Confirm current rates on gov.uk. Our grants and funding page and the guide on how to fund a commercial HVAC upgrade map the routes that genuinely apply.

For a figure specific to your building, ask for a desk feasibility — a good contractor models the full installed cost, and the whole-life running cost, from a survey before you commit, and can stage the work where a single capital hit is not affordable.

Frequently asked questions

How much does commercial air conditioning cost per square metre?

Cost per square metre is a poor guide, because HVAC cost tracks load, not floor area. A lightly-loaded office and a heat-dense data suite of the same size can differ threefold. For benchmarks by system type, see the cost ladder. A reliable figure for your building comes from sizing on its real heat gains and modelling from consumption data, not applying a rate per square metre.

Is it cheaper to refurbish or replace an old air handling unit?

Frequently to refurbish. Retrofitting EC fans, replacing coils, adding heat recovery and upgrading filtration can cut fan energy substantially and improve indoor air quality for a fraction of a full replacement’s cost and disruption. Replacement is the honest answer only where the casing is corroded, the layout is wrong or the building’s duty has changed. The right approach is a whole-life-cost comparison of both options from a survey, not a default replacement.

Are there grants to reduce commercial HVAC cost?

The £7,500 Boiler Upgrade Scheme is a flat grant towards air-source and ground-source heat pumps up to 45 kWth in homes and non-domestic buildings in England and Wales; it does not fund VRF, chillers or air handling units. Commercial HVAC is funded through the tax system: the Annual Investment Allowance (100% on up to £1m a year) and, for companies, the 50% first-year allowance for special-rate assets — heating, ventilation and air-cooling plant is usually special-rate, so full expensing does not normally apply. Eligible energy-intensive industrial sites could historically use the Industrial Energy Transformation Fund, which closed to new applications in July 2025 with no successor planned.

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Authoritative references: the government’s capital allowances guidance, including full expensing for main-rate plant and CIBSE for commercial HVAC design and sizing.