Retail units are tricky rooms to keep comfortable. The shopfront faces the street, often into the afternoon sun. Doors open every few minutes. Display lighting runs for hours. Staff are on their feet all day, and in winter the person on the till is often the coldest in the building.
This guide is for shop owners, showroom managers and retail facilities teams. It covers sizing, unit choice, placement, the paperwork that comes with a lease and the legal checks on larger systems.
What drives the load in a shop
At survey we look at the things that make retail different:
- Shopfront glazing. Large panes facing south or west let in a lot of solar heat. Window displays heat up too.
- The door. An open door lets conditioned air out and outside air in. For shops that trade with the door open, an air curtain can make a real difference.
- Lighting and equipment. Display lighting, screens, tills and, in some shops, coffee machines or chillers.
- Customers. A quiet weekday and a Saturday sale are very different. We size for the busy times.
- Heating. Most modern systems are heat pumps, so the same units can heat the shop in winter. If that’s the plan, we size for both.
Choosing units for the sales floor
| Type | Good for | Watch out for |
|---|---|---|
| Wall-mounted | Small shops, kiosks, back offices | Takes wall space you may want for display |
| Cassette | Shops with suspended ceilings; spreads air in several directions | Needs ceiling void depth and access |
| Ducted | Showrooms and design-led fit-outs: only grilles on show | Needs void space and planned filter access |
| VRF | Larger stores and multi-floor units with several zones | A bigger design job; priced after survey |
Placement matters as much as type. We keep cold air off the till point and changing rooms, avoid blowing onto stock that could be damaged or moved by airflow, and pick positions where filters can be reached without moving displays.
Stockrooms, back offices and comms cupboards
Stockrooms with chocolate, cosmetics or electronics may need cooling all year. Comms cupboards holding the EPOS and network kit can overheat quietly behind a closed door. These are often best on a separate small system, so they keep running when the shop floor units are off. See our server room page.
Want it done properly? AirCon Doctor installs, repairs and services air conditioning and heat pumps across London and the South East, from our base in East Grinstead. We’re an F-Gas certified company and NICEIC approved. Get a fixed-price quote.
Outdoor units, leases and planning
Retail units are usually leased, and the lease will almost always require the landlord’s consent for external plant, pipe routes and holes in the structure. Shopping centres and retail parks often have their own rules on where plant can go. Outdoor units commonly sit on a rear wall, a flat roof or in a service yard. We check the route for pipes and condensate, the manufacturer’s clearances and access for maintenance.
Planning permission for air conditioning plant on commercial premises is a matter for the local council, especially in conservation areas or on listed buildings. We flag likely questions at survey so you can raise them early.
Fitting it around trading
Engineers on ladders in the middle of a busy sales floor isn’t ideal for anyone. At survey we agree when we can work and how to keep the shop safe and trading, whether that’s a phased programme or working in sections. Dust sheets, barriers and tidy pipe routes are part of the plan.
F-Gas, TM44 and maintenance
The retailer or landlord who controls the system is its operator. Systems with 5 tCO2e or more of refrigerant need leak checks at least every 12 months. If the building’s air conditioning has a total effective rated output of more than 12 kW, an accredited energy assessor must carry out an air conditioning energy inspection at least every five years, and the guidance notes a fixed penalty for not having a report. Several small units can add up past the threshold.
Filters in shops near busy roads or with lots of foot traffic load up fast. A yearly service is the minimum, and a maintenance contract keeps records together for every site.
Costs
A single wall-mounted split for a small shop falls in our standard range of £1,200 to £2,200 + VAT, including supply, installation, commissioning and F-Gas documentation. Larger shops, cassette, ducted and VRF systems are priced after a survey with a fixed-price quote. Businesses pay the standard rate of VAT. See our retail air conditioning page.
Quick answers
Will air conditioning work if we keep the shop door open?
It will work harder and cost more to run. An air curtain over the door helps keep conditioned air in, and we size the system with an open door in mind if that’s how you trade.
Do I need my landlord’s permission?
Almost certainly. Leases usually require consent for external plant and holes in walls or roofs. Shopping centres often have their own rules too.
What’s the best air conditioning for a showroom?
Cassettes or ducted units, because they keep walls clear for display and spread air evenly. The right choice depends on ceiling void depth and access.
Related services
- Retail air conditioning
- Commercial air conditioning
- Cassette air conditioning
- Air conditioning maintenance contracts
More advice
- Air Curtains Explained
- Air Conditioning for Offices: What You Need to Know
- Air Conditioning for Restaurants: Installation Guide
- Commercial Air Conditioning: What Businesses Need to Know
- All advice
This guide is general information, checked against the sources linked on 30 October 2026. It isn’t legal, tax or financial advice. Rules, grants and product ranges change, so check the current position before you rely on it.