Cool the office pod, the mezzanine room or the cabin where people sit. Do not try to air condition the warehouse around it. The shed is a large, leaky, dusty volume with doors that open for lorries. The office is a small room with a door you can shut. A normal commercial split, sized for that room, with filtration that respects dust and an outdoor unit out of the forklift path, is the proportionate design. Conditioning the whole building is a different order of project.
A door you can shut, not a curtain in the aisle
A pod with a door, insulation and a ceiling is a room. A desk behind a plastic curtain in the aisle is not. If the enclosure is poor, spend the first money on the box, then on the split. Cooling a curtain is cooling the shed by accident.
Desk work and shed work are different duties
People working at desks are entitled to reasonable thermal comfort under HSE guidance. Pickers in a shed may be in a different clothing and work-rate category, and the building may never have been a conditioned space. Solve the office. Use fans, shade, break rotas and the building's existing ventilation for the shed unless someone is deliberately designing warehouse cooling.
Cardboard fluff and a reversing lorry
Cardboard fluff and vehicle dust load filters quickly.
- Condition the enclosed office only.
- Keep the condenser out of forklift and loading-door air.
- Specify filtration for warehouse dust.
- The maintenance interval should be short, and the indoor unit needs access that does not require a pallet move.
A shed that is hotter than the yard
In summer the shed can be hotter than outdoors. The office then has a high surrounding temperature as well as its own people and computers. Tell the surveyor. A unit sized as if the pod sat in a cool corridor will disappoint. Insulation and a door closer are part of the cooling design. A cassette over a desk is fine if the ceiling void exists. A wall unit on the office wall is often simpler. Shut the door while the unit runs. Warehouse dust will wreck the unit if filters are domestic and ignored. Keep the door shut, and do not site the indoor return in the aisle. Service it more often than a high-street office.
Heating the pod on a frosty yard
In winter a reverse-cycle split can heat the office when the shed is cold, which is often the more valuable half of the purchase. Ask for heating capacity at a low outdoor temperature. Defrost behaviour on a frosty yard is normal. It will not heat the warehouse. The Planning Portal heat-pump page is a domestic reference. A warehouse yard still needs a check against planning, the lease and where noise will land. Wall brackets and anti-vibration feet still matter if the office is a lightweight mezzanine. A competent electrician runs a dedicated circuit. An F-gas certified company commissions the refrigerant side. GOV.UK publishes that certification.
When the hall is the wrong order of cost
One big unit for the warehouse and the office is the wrong approach. It will try to cool a volume you cannot shut, and the office will still suffer when the dock doors open. Cool the enclosed office. Treat the shed as a separate decision. As a 2026 illustration, cooling and heating a 15 to 25 square metre office pod with a single split commonly sits in a familiar installed band of a few thousand pounds including VAT, depending on power, pipe route and mounts. Attempting to cool the warehouse hall is a different design and a different order of cost, often an order of magnitude away once air volume and open doors are admitted. Ask for the pod price first. If several pods and a mezzanine grow into a larger system, check GOV.UK to see whether air conditioning inspections apply, and check leak-check duties against the carbon-dioxide equivalent rather than a guessed kilogram figure. Energy Saving Trust's air-to-air pages describe the split that heats and cools the pod. They do not describe the shed.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.