Choosing the right system for a commercial space
Commercial installations generally use VRF (Variable Refrigerant Flow) or VRV systems, which allow multiple indoor units — serving different rooms or zones — to run from a shared outdoor unit or units, each independently controlled. This makes them well suited to offices and retail spaces where different areas have different occupancy levels and heat loads through the day, such as a busy reception area versus a quiet back office.
Sizing for occupancy and equipment
Commercial spaces need sizing calculations that go beyond room dimensions. Occupancy density, equipment heat output — server rooms and kitchens in particular — and glazing all factor into an accurate load calculation. Undersizing is a common and costly mistake in commercial fit-outs, since a system that can’t keep pace on the hottest days affects staff comfort and, in retail settings, customer experience directly.
Compliance requirements
Commercial systems above a certain refrigerant charge fall under stricter F-Gas leak-checking obligations than residential systems, with regular inspection intervals set by law. Building Regulations Part L also applies to new commercial installations, covering minimum efficiency standards. A commercial installer should be able to confirm compliance with both as part of the quote.
Typical costs
Commercial installation costs are usually quoted per square metre or per zone rather than as a flat fee, given the variability between a small retail unit and a multi-floor office. As a rough guide, expect £80–£150 per square metre for a VRF system installation in an office environment, with costs varying based on the number of zones, existing infrastructure, and access.
Minimising disruption during installation
Most commercial installers offer out-of-hours or weekend fitting specifically to avoid disrupting business operations, particularly for retail units that can’t close during trading hours. Phased installations across a working week are also common for larger office fit-outs, allowing different floors or zones to be completed without shutting down the whole space at once.
Ongoing maintenance
Most commercial clients move to a maintenance contract after installation, covering scheduled servicing and priority call-out response, both of which matter more in a commercial setting where downtime has a direct cost.