Commercial kitchen cooling and ventilation
Kitchens are the hardest commercial spaces to keep comfortable, and it's not simply because of the heat from the equipment. Extract canopies remove huge volumes of air continuously, grease coats anything mounted near cooking lines, and staff comfort has to be balanced against food safety and fire regulations that don't apply anywhere else in the building.
We work on kitchen environments alongside restaurants and takeaways across Hertfordshire and the surrounding counties, and the common thread is that cooling can't be designed in isolation from the extract system already running. Get that relationship wrong and the air conditioning fights a battle it can't win.
Extract versus cooling: different jobs, easily confused
Kitchen extract removes heat, steam, grease particles and cooking odours at source, typically through a canopy over the cook line venting outside. It's a legal and food safety requirement, not an optional comfort feature, and it's usually sized around cooking equipment output rather than staff comfort.
Air conditioning, by contrast, is about maintaining a comfortable temperature for staff in the areas away from the immediate cook line, such as prep areas, pass areas and front-of-house adjoining space. The two systems have to be designed together, because a kitchen extracting large volumes of air needs replacement air brought in from somewhere, and if that's not planned properly the air conditioning ends up cooling air that immediately gets pulled straight back out.
Make up air: the detail most kitchens get wrong
Every cubic metre of air an extract canopy removes has to be replaced by air coming in from somewhere, whether that's a dedicated make up air unit, gaps under doors, or simply air pulled from adjoining rooms. Without a proper make up air supply, kitchens run under strong negative pressure, which drags in draughts from all directions, makes doors difficult to open, and can pull unconditioned or even unfiltered air from unwanted sources like bins stores or car parks.
A make up air unit, tempered and filtered before it enters the kitchen, solves this properly by replacing extracted air with conditioned air rather than whatever happens to leak in. It also takes pressure off the air conditioning system, because it isn't trying to cool a kitchen that's continuously drawing in hot, humid outside air through gaps.
Grease and its effect on equipment
Grease-laden air migrates further than most kitchen staff expect, settling on indoor unit coils, filters and fan blades even outside the immediate cook line if air conditioning units are sited too close to cooking areas. This build-up reduces airflow, cuts efficiency and, over time, creates a fire risk on top of the maintenance issue.
Positioning cooling units away from direct grease-laden airflow paths, and specifying more frequent filter cleaning in maintenance contracts for kitchen environments than you would in an office, keeps this under control. It's a detail worth raising specifically when agreeing a maintenance schedule for any kitchen site.
Balancing staff comfort with food safety
- Cool prep and pass areas separately from the cook line itself, since trying to cool directly over active cooking equipment is largely wasted effort against extract and radiant heat.
- Keep air conditioning airflow away from open food preparation surfaces to avoid disturbing food safety controls or blowing contaminants across worktops.
- Site indoor units away from direct grease paths and steam plumes from dishwashers and cooking equipment.
- Agree filter cleaning frequency with your maintenance provider based on kitchen use, not a generic office schedule.
How this interacts with refrigeration
Kitchen ambient temperature directly affects refrigeration performance, since fridges and freezers close to hot cook lines or without adequate airflow around their condensers have to work harder to hold temperature, increasing running costs and wear. A kitchen where general ambient temperature is under control through good extract, make up air and comfort cooling design puts less strain on refrigeration equipment as a knock-on benefit.
If your kitchen is uncomfortably hot for staff, struggling with grease build-up on equipment, or your refrigeration seems to be working harder than it should, it's worth having the whole picture surveyed together rather than treating cooling, extract and refrigeration as separate problems. Get in touch for a free quote and we'll look at how they interact in your specific kitchen.
FAQs
Common questions
Does air conditioning work well directly over a cook line?
Not really. Extract and radiant heat from cooking equipment overwhelm most comfort cooling in that immediate zone, so cooling is better focused on prep, pass and adjoining areas.
What is make up air and do all kitchens need it?
Make up air replaces the volume of air removed by extract canopies. Any kitchen with significant extract needs some form of make up air supply to avoid negative pressure problems.
How often should air conditioning filters be cleaned in a kitchen?
More frequently than in a typical office, since grease and steam build up faster. Your maintenance provider should agree a kitchen-specific schedule rather than a standard one.
Can poor kitchen ventilation affect refrigeration performance?
Yes, high ambient temperature around fridges and freezers makes them work harder to hold temperature, increasing running costs and the risk of faults.
Is kitchen extract a legal requirement separate from air conditioning?
Yes, kitchen extract is generally required for food safety and fire regulation reasons regardless of whether comfort cooling is also fitted.
Keep reading
More from our knowledge base
Fault & symptom guides
Catering fridge or freezer broken down? What to do first
The first half hour after a catering fridge or freezer fails decides how much stock you save, so act on the food first and the fault second.
Cost & process guides
Ice Machine Installation: What to Expect and How to Prepare
Short answer: an ice machine needs a cold water feed, a proper drain, a power supply and room to breathe; get those right and the fitting itself is straightforward.
Fault & symptom guides
Air Conditioning Blowing Warm Air
Warm air from a unit that should be cooling usually means either a settings mix-up or a refrigerant fault, and telling the two apart matters.
Talk it through with an engineer.
No call centre — you speak to Ted directly.