Restaurant and hospitality air conditioning

There is one question that decides whether air conditioning works in a restaurant, and most quotes never ask it: where does the air replacing your kitchen extract come from? A commercial kitchen canopy can pull a very large volume of air out of the building every hour. That air has to be replaced from somewhere. If nobody has designed where from, the answer is your dining room — which means you are paying to cool air that goes straight up the extract hood, your front door becomes an air inlet, and if you cook on gas you have a safety problem as well as a comfort one. Kitchen ventilation and dining-room comfort are not two projects. They are one air balance, and they must be surveyed together.

The dining room and the kitchen share one air balance

Catering produces significant quantities of fumes and vapours as well as large amounts of heat, and HSE guidance is that this is normally removed by mechanical extraction through a canopy hood over the cooking appliances, discharged to a safe external location, with the system also providing general ventilation throughout the kitchen [1].

Extract on that scale makes the kitchen negative in pressure relative to everything around it. Air flows in to replace what leaves, and it takes the easiest available route. In a restaurant where nobody has designed a make-up air supply, the easiest route runs from the street, through the dining room, past your customers, through the kitchen door, and out of the canopy.

Three consequences follow, and operators usually meet all three at once:

• Your cooling bill is subsidising the extract hood. Air you have paid to cool is leaving the building within minutes of being conditioned. The system runs constantly and the room never settles.
• The front of house becomes a wind tunnel. With the dining room at negative pressure, every opening of the street door pulls outside air across the nearest tables. In February that is the table nobody will sit at; in August it is a wall of warm air that defeats the cooling entirely.
• Odour tracks the wrong way. Air moving from the dining room into the kitchen sounds like it should keep cooking smells out of the restaurant. It does — right up until the extract is off or throttled, at which point the pressure relationship reverses and the room fills.

Make-up air is also a gas safety question

This is the part that turns an efficiency problem into a serious one. HSE is explicit: it is particularly important to provide adequate make-up air for gas-fired appliances, because a lack of an adequate supply of air, or incorrect flueing, can lead to incomplete combustion and the accumulation of combustion products such as carbon monoxide [1].

A kitchen that is over-extracted and under-supplied is exactly the condition that guidance warns about. Adding a comfort-cooling system to the dining room without touching the make-up air design does not create that condition, but it can mask it — a sealed, better-conditioned front of house gives the kitchen fewer easy paths to draw replacement air from, and the room goes further negative.

Gas appliances themselves carry separate duties. Employers must ensure gas appliances, flues, pipework and safety devices are maintained in a safe condition and inspected by a competent person, with annual inspection a reasonable minimum frequency in general, and contractors' Gas Safe registration checked [1].

Space by space

Sizing for the peak cover, not the floor area

A restaurant's heat load is not a floor area. It is a schedule. The same dining room is nearly empty at 15:00 and at 80 covers with full lighting at 20:30, and it reaches peak occupancy at exactly the moment the kitchen is working hardest.

A survey worth paying for counts:

• Covers at peak, not seats on the plan.
• Heat migrating from the kitchen through the pass, servery and door openings — which a well-designed extract minimises but never eliminates.
• Glazing and orientation. A west-facing frontage carries substantial solar gain into the evening service.
• Lighting and display. Restaurant lighting schemes and back-bar chillers are real, continuous loads.
• Trading pattern, because the design has to cope with two services a day and long quiet stretches without over-cooling the empty room.

Controls do the rest. A system sized for peak covers and left uncontrolled will freeze the room at 15:00; the answer is zoning and setback, not a smaller system.

Kitchen staff, and what the law actually requires

There is no legal maximum working temperature in the UK. HSE is explicit that no meaningful upper limit can be imposed, because in many indoor workplaces high temperatures are created by the work activity itself — bakeries and foundries are the examples given, and a commercial kitchen belongs on the same list [3]. What employers must do is keep the temperature at a comfortable level and provide clean, fresh air [3].

For the kitchen, that duty is discharged principally through ventilation and extraction rather than comfort cooling [1]. For front of house, the minimum indoor workplace temperature is normally at least 16°C [3], which matters for staff standing at a host desk beside a door that opens two hundred times a service.

Installing without losing a service

A closed restaurant is lost revenue at a known nightly rate, so the programme matters as much as the price:

1. Survey with the head chef present, not only the owner — the kitchen's extract behaviour is knowledge that lives at the pass.
2. Agree the air-balance strategy before equipment is selected, because make-up air provision may change what the dining-room system needs to do.
3. Phase the work around closed days and out-of-hours slots, with core drilling and structural work scheduled first.
4. Confirm the deep clean and any food-safety sign-off needed before service resumes, and agree who does it.

Where the venue sits under or beside flats, condenser and extract siting need settling with the local authority before quotes are compared, not after — our planning and compliance guide covers the ground, and the external unit guide explains what makes a position workable.

Duties once the system is in

F-gas. The party using stationary air-conditioning equipment is responsible for having it checked for leaks, with records kept five years [4]. At 5 tonnes of CO₂ equivalent or more, checks fall due at least every 12 months [4].

TM44. Above 12kW combined effective rated output, an accredited energy assessor must inspect the system at intervals not exceeding five years [5]. The threshold combines across the premises. See our TM44 and F-gas guide.

Maintenance. Hospitality is hard on equipment — airborne grease migrates further than people expect, and filters in a restaurant load faster than in an office. A planned maintenance contract scheduled around service, rather than reactive callouts during one, is the difference between a system that lasts and one that does not.

What restaurant air conditioning costs

Hospitality systems are priced from a survey, because the air balance and the plant position drive the cost more than the dining room's floor area does. As planning figures drawn from our commercial cost guide:

• Ceiling cassettes for the dining room: typically £2,500–£4,500 per cassette installed.
• A multi-zone VRF system serving dining room, bar and private areas: commonly £8,000–£20,000 depending on zone count and plant siting.
• Make-up air provision and any kitchen ventilation work is a separate line, priced by a ventilation contractor. Budget for it as part of the same project even when it is quoted separately.

Frequently asked questions

Can air conditioning cool a commercial kitchen? Not on its own, and it is not the right tool. Kitchen heat, fumes and vapour are removed by designed extraction through a canopy hood, with adequate make-up air supplied [1][2]. Spot cooling at the pass can be added afterwards, once the ventilation is right.

What is make-up air and why does it matter? It is the air supplied to replace what the kitchen extract removes. Without it the kitchen draws replacement air from the dining room and the street, wasting conditioned air and creating draughts — and for gas appliances, inadequate air supply risks incomplete combustion and carbon monoxide [1].

Is there a maximum legal temperature for a restaurant kitchen? No. HSE states no meaningful upper limit can be imposed where heat is created by the work activity. Employers must keep the temperature comfortable and provide clean, fresh air [3].

Why is the front of the restaurant always draughty? Usually because the building sits at negative pressure from over-extraction, so every door opening pulls outside air in. An air curtain treats the symptom; correcting the air balance treats the cause.

Will cooking smells get into the dining room? Only if the pressure relationship between kitchen and restaurant is wrong or the extract is undersized. This is another reason the two systems must be designed together.

Can it be installed without closing? Usually yes. Most hospitality installations are phased across closed days and out-of-hours slots, with the noisy structural work front-loaded.

Getting a survey that covers both systems

Tell us about the venue — covers, kitchen type, whether you cook on gas, and what extract is already in place — and we will match you with one vetted, commercially capable installer. One enquiry goes to one installer, and your details stay private until they accept: start a business enquiry.