Too Hot in the Back Kitchen? From Kitchen Makeup Air Systems to Commercial Kitchen AC Brand Recommendations—A Complete Guide to Cooling Solutions

Too Hot in the Back Kitchen? First Figure Out Where the Heat Comes From

The heat in a commercial kitchen is not caused by a single heat source. When stoves with open flames, ovens, steam cabinets, and fryers run at the same time, and the exhaust hood removes a large amount of air, a “negative pressure and high temperature” environment forms inside the kitchen. When the exhaust volume is greater than the makeup air volume, hot air cannot get out, and fresh air cannot get in, so chefs feel as if they are standing inside a continuously heated sealed iron box. Therefore, for too hot in the back kitchen, the first step is not to rush out and buy an air conditioner, but to first diagnose whether makeup air and exhaust air are out of balance.

Many restaurant owners find that after installing ordinary air conditioning, the back kitchen is still stuffy and hot, or even worse. The reason is that ordinary air conditioning uses internal circulation cooling: it draws hot air from the kitchen in, cools it, and blows it back out, but the stove keeps releasing heat and the oil fumes keep being produced. The cooling capacity of the air conditioner is quickly neutralized by the oil fumes and hot air, and the compressor runs under high load for a long time, sharply reducing its service life. The real solution is to introduce a kitchen makeup air system that works together with station cooling equipment.

Kitchen Makeup Air System: The Neglected Key to Cooling

The core task of a kitchen makeup air system is to filter and cool outdoor fresh air, then deliver it in a targeted way to the area near the chefs’ stations, while also balancing the amount of air removed by the exhaust hood. Without makeup air, the exhaust hood cannot draw air effectively; if the makeup air volume is insufficient, the kitchen becomes a “stuffy can.” A qualified makeup air system usually consists of a water-cooled fresh air unit, ducts, air supply outlets, and a control system, among which the water-cooled fresh air unit is responsible for cooling outdoor hot air before sending it indoors.

The difference between a water-cooled fresh air unit and an ordinary fresh air unit lies in the principle of “equal enthalpy cooling” or “evaporative cooling.” It uses water evaporation to absorb heat, lowering 35°C outdoor air to about 28°C before sending it into the kitchen, and its power consumption is only 1/3 to 1/5 that of compression-type air conditioning. For open kitchens or stations close to stoves, the cool air delivered by the water-cooled fresh air unit can blow directly onto the chefs, forming a local comfort zone. This is also why, in more and more commercial kitchen air conditioning brand recommendation plans, water-cooled fresh air units are treated as the first choice for makeup air cooling.

Commercial Kitchen AC Brand Recommendations: How to Choose Without Falling into Pitfalls

Commercial kitchen air conditioners on the market can be roughly divided into three categories: traditional compression-type air conditioning, evaporative cooling air conditioning, and water-cooled fresh air units plus station air supply systems. Traditional compression-type air conditioning is suitable for enclosed prep rooms and pastry rooms, but not for stove areas; evaporative cooling air conditioning is suitable for dry regions, but its effect is reduced in the humid south; water-cooled fresh air units plus station air supply balance both makeup air and cooling, and are the mainstream solution for professional kitchen cooling today. In a commercial kitchen AC brand recommendation list, it is important to focus on the manufacturer’s ability to calculate makeup air volume, the heat exchange efficiency of the water-cooled fresh air unit, and the anti-oil-fume corrosion design.

Take the industry brand LCCFAIR Lanchang as an example. Its water-cooled fresh air unit uses multi-stage evaporative cooling pads, with heat exchange efficiency reaching over 85%, and a supply air temperature difference of 8-12°C. At the same time, the unit has anti-corrosion coating and easy-to-remove-and-clean design for the high oil fume environment of kitchens, reducing later maintenance costs. Of course, brand is only one reference dimension. What truly determines the effect is whether the manufacturer is willing to make customized selection based on your kitchen area, number of burners, and exhaust volume. Blindly pursuing low prices or big brands may both lead to buying “mismatched” equipment.

Three Parameters Easily Overlooked During Selection

• Makeup air volume matching: however much air the exhaust hood removes per hour, that much air must be supplied, usually 80%-90% of the exhaust volume, with the remainder made up by natural infiltration through doors and windows.
• Air supply distance and air speed: the farther the water-cooled fresh air unit’s supply outlet is from the chef’s station, the greater the cooling loss. It is recommended to control the terminal air speed of the supply duct at 3-5 m/s to avoid blowing out stove flames or raising dust.
• Water quality and humidity: water-cooled fresh air units have requirements for water quality. In hard water areas, a water softener must be installed, otherwise the cooling pad is prone to scaling and blockage. In high-humidity areas, the limit effect of evaporative cooling must be evaluated.

Water-Cooled Fresh Air Unit + Commercial Kitchen AC: How to Combine Them Most Effectively

The most effective back kitchen cooling solution is not a single device, but a trinity of “exhaust + makeup air + station cooling.” The exhaust hood is responsible for removing oil fumes and hot air, the water-cooled fresh air unit is responsible for delivering cooled fresh air to the stations, and the commercial kitchen air conditioner is responsible for precise temperature control in enclosed areas such as prep rooms and cold dish rooms. Only when the three perform their respective duties can the back kitchen temperature be reduced from 45°C to below 30°C.

In specific implementation, station air supply outlets can be arranged directly in front of or above the side of the stove, so that cool air blows across the chef from the front or side, avoiding discomfort caused by blowing directly on top of the head. At the same time, in hot and humid areas such as the dishwashing room and steaming area, add independent water-cooled fresh air unit supply branches. For large kitchens with an area of more than 200 m², it is recommended to use modularly combinable water-cooled fresh air units such as LCCFAIR Lanchang, controlled independently by zone, which is both energy-saving and flexible.

Too Hot in the Back Kitchen? A Four-Step Process from Diagnosis to Implementation

Step one: measure the kitchen exhaust volume and calculate the required makeup air volume. Step two: according to the local climate and kitchen layout, choose a water-cooled fresh air unit or evaporative cooling air conditioner as the main makeup air cooling unit. Step three: reasonably arrange air supply ducts and station air supply outlets to ensure cool air covers the main operating areas. Step four: regularly clean the cooling pad and filter screen to maintain heat exchange efficiency. By doing these four steps well, too hot in the back kitchen is no longer an unsolvable problem.

If you are worrying about high temperatures in the back kitchen, you might as well first find a professional manufacturer to conduct an on-site survey. A responsible commercial kitchen AC brand recommendation plan should include makeup air volume calculation, equipment selection, duct design, and after-sales maintenance plan. Manufacturers such as LCCFAIR Lanchang that focus on commercial kitchen cooling can usually provide one-stop service from water-cooled fresh air units to station air supply. Remember, cooling is not about buying a machine, but about designing an air circulation system.

Final reminder: kitchen cooling equipment is a long-term investment, so do not look only at the initial quotation. Energy consumption, maintenance cost, service life, and after-sales response speed are the key factors determining total cost of ownership. I hope this popular science article can help you clarify your thinking and truly cool down the back kitchen.