Cooling a restaurant is two problems pretending to be one. Out front, you have customers who want a comfortable, quiet, pleasant room they will happily sit in for two hours. Out back, you have a kitchen that generates enormous amounts of heat, runs extract systems that pull air straight out of the building, and pushes chefs to their limit on a busy service. Treat those two spaces as a single cooling job and you end up with one of them miserable. Usually both.
This guide covers how to think about restaurant and kitchen cooling as the separate problems they are, the systems that suit each, and the bit almost everyone gets wrong: how air conditioning and kitchen extract have to work together. If you are planning a fit-out, it pairs well with a proper commercial air conditioning installation.
Front of house: comfort, quietly
The dining room is, on paper, a standard comfort cooling job. The complications are the things that make a restaurant a restaurant: the heat load swings wildly between an empty mid-afternoon and a full Saturday night, large windows and doors leak heat, and the last thing you want is a unit roaring away over a romantic dinner.
The priorities front of house are:
- Even cooling without draughts. Nobody wants the table under the unit shivering while the back of the room swelters.
- Quiet operation. Diners notice noise. Indoor unit sound levels matter as much as capacity.
- Zoning. A bar, a dining area and a private room often need separate control, because they fill and empty at different times.
- Capacity for a full house. Size for peak covers on a hot evening, not for the quiet average.
Systems that suit a dining room
Ceiling cassettes are popular in restaurants because they distribute air in four directions from a tidy ceiling fitting, which helps avoid the draughty hot-and-cold-spot problem. For larger or multi-zone venues, a VRF system lets you run several indoor units from one outdoor unit with independent control of each zone, which is ideal when the bar, the restaurant and a function room all want different things. Where layout allows, wall-mounted splits still do a perfectly good job in smaller spaces. Our guide to split versus cassette systems goes into the trade-offs.
Back of house: the kitchen is a different animal
A commercial kitchen is one of the most demanding environments you can ask a cooling system to work in. Ovens, ranges, grills, fryers and dishwashers throw out serious heat, and that heat is relentless during service. Comfort for the staff is not a luxury here, it is about safety and being able to work. But you cannot just point a big air conditioner at the problem, because the kitchen already has a powerful system moving air: the extract canopy.
The extract ventilation problem
The extract canopy over the cooking line pulls a large volume of air out of the kitchen to remove heat, smoke, grease and cooking smells. That air has to be replaced, which is the job of make-up air. Here is where it goes wrong: if you install air conditioning without accounting for the extract, the AC either fights the extract system or simply has its cooled air sucked straight out of the building before it does any good. You end up paying to cool air that leaves through the canopy.
The two systems have to be designed together. Kitchen ventilation in the UK is commonly designed to BESA's DW/172 specification, and the cooling has to be planned around the extract and make-up air strategy, not bolted on afterwards. Get the balance right and the kitchen is workable; get it wrong and no amount of cooling capacity will fix it.
Zoning: the single most important decision
The biggest mistake in restaurant cooling is treating the whole venue as one zone. The kitchen and the dining room have opposite needs and different schedules, and a single system trying to serve both pleases neither.
| Zone | Priority | Typical approach |
|---|---|---|
| Dining room | Quiet, even comfort for customers | Cassettes or VRF, zoned by area |
| Bar | Independent control, often busy when kitchen is winding down | Its own zone or unit |
| Kitchen | Staff comfort, balanced with extract | Cooling designed around the extract and make-up air |
| Private / function room | On-demand use | Separate zone, off when unused |
Practical details that matter in hospitality
- Hygiene and cleaning. Units in food areas need filters that are easy to access and clean, and a maintenance routine that keeps them that way. A neglected unit in a kitchen is a hygiene risk, not just an efficiency one.
- Smell and grease. Cooking grease finds its way into everything. Filtration and regular cleaning keep units working and smelling neutral.
- Refrigerant rules. Commercial systems fall under current F-gas regulations, which affect what gets installed and how it is maintained.
- Running costs. Hospitality margins are thin, so efficiency counts. Our guide to air conditioning running costs is worth a look when you are budgeting.
- Maintenance. A restaurant cannot afford a breakdown mid-service in July. Planned maintenance is the cheapest insurance there is.
Don't forget the cold side
A restaurant lives and dies by its refrigeration as much as its air conditioning. Walk-in cold rooms, display fridges and prep counters all need to hold temperature reliably, and they sit naturally alongside the comfort cooling work. If you are fitting out a kitchen from scratch, it is worth planning the commercial refrigeration at the same time as the air conditioning so the two are coordinated rather than competing for space and power.
Frequently asked questions
Why does my restaurant kitchen stay hot even with air conditioning?
Usually because the cooling has not been balanced with the extract ventilation. The canopy over the cooking line pulls a large volume of air out of the kitchen, and if make-up air and cooling are not designed around it, your conditioned air gets sucked straight out before it helps. The fix is to design the AC and the extract system together, not separately.
Should the kitchen and dining room share one air conditioning system?
No. They have opposite needs and different schedules, so they should be separate zones at a minimum, and often separate systems. A single setup trying to serve both ends up overwhelmed by the kitchen heat or too cold for diners. Zoning is the most important decision in restaurant cooling.
What type of air conditioning is best for a restaurant dining room?
Ceiling cassettes are a popular choice because they spread air evenly and avoid draughty hot and cold spots, while VRF systems suit larger or multi-zone venues that need independent control of the bar, restaurant and function areas. The right answer depends on the layout, the ceiling, and how the space is used.
Does kitchen air conditioning have to comply with ventilation standards?
The cooling has to be designed around the kitchen's extract ventilation, which in the UK is commonly specified to BESA's DW/172. The air conditioning itself also falls under F-gas regulations for installation and maintenance. In practice this means using engineers who understand both the cooling and the ventilation side rather than treating them as separate jobs.
Planning a restaurant fit-out?
Restaurant cooling rewards getting the design right before anything goes on the wall. If you are opening a new venue or struggling with an existing setup that never quite copes, a survey that looks at the whole picture, dining room, bar and kitchen together, is the place to start. Get in touch with Be Cool and we will help you plan it properly.
Written by
Ali Elm
Ali is the Head of Operations at Be Cool Refrigeration with over a decade of hands-on experience in HVAC and commercial refrigeration. He oversees every installation, repair, and maintenance project, making sure the work meets the highest standards. Ali holds full F-Gas certification and has worked across residential, commercial, and industrial refrigeration systems throughout London and the South East. When he is not on site, he writes these guides to help business owners and homeowners understand their cooling systems better.