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We Manufacture All Sizes Unit Cooler for Cold Room

We customize all types unit cooler ( evaporator unit, indoor unit) with different size, fin spacing and material, fan diameter is 300~700mm or even more, contact us for details.

Unit Cooler

Unit cooler is also called evaporator unit, indoor unit, is an essential refrigeration equipment for Cold Room.

It is mainly composed of 5 important components: cooling and heating exchange pipe, axial flow fan, liquid separator, defroster, and water tray.

It relies on the axial flow fan forcing the air (in the cold room) to flow through the cooling exhaust pipe of heat exchange aiming to cool the air, finally achieve the purpose of lowering the cold room temperature.

Cold room temperature

Our Partnership

Panasonic fan motor
guentner logo
Modine logo
heatcraft logo
Russell logo
bitzer logo

Unit Cooler Production Process

Casing Printing

Evaporator Processing


Finished Product

Unit Cooler Fin

Fin color is optional: Bule, golden, and natural.

Depending on the ambient temperature, unit cooler will use different fin spacings.

Commonly used fin spacings for unit coolers are 4mm, 4.5mm, 6~9mm, 10mm, 12mm, and 16mm.

The lower the cold room temperature, the larger the fin spacing required. Incorrect fin spacing means the fin frosting speed will be fast, which will quickly block the air passage, and  making it difficult to cool the cold room. Meanwhile , result in the compressor inefficiently and  increasing the power consumption of the whole refrigeration system.

Unit cooler fins 01

Fin Spacing

#1. Medium / High temperature cold room (-15℃~20℃)

Such as workshop, shady storage,  fresh storage, air conditioning storage, ripening storage, etc., the fin spacing should be 4mm or 4.5mm.

Fin spacing

#2. Low temperature cold room (-16°C~-25°C)

Such as low-temperature freezer, low-temperature logistics warehouse, the fin spacing should be 6mm~9mm.

#3.Blast freezr cold room (-25℃~-45℃)

Fin spacing is generally 10mm~12mm. If the humidity of the quick-frozen goods is high, had better select the unit cooler with variable fin spacing, and the fin spacing on the air inlet side can be 16mm.

Note: In some occasions, Can’t select the fin spacing simply by temperature, such as the frequency in/out of stored items (such as meat, fish, seafood and vegetables,etc) please Contact Our Salesman for unique solution.

Unit Cooler Coil

# Array ways of unit cooler coil

There are 2 array ways of unit cooler : cross and positive.

In same cooling area and wind speed, the heat transfer efficiency of cross array is better than positive array; However, the cross array produces more resistance when the air flows than the positive array. When use the same fan, the heat exchanger air volume of cross array is smaller than positive array.

At same heat exchange area, if the coil arrangement is different, the product’s heat exchange volume is different.

Tooth-shape inner-grooved copper tube

Inner-grooved Copper Tube

Cross Array-cold room coil

Cross Array

Positive Array-cold room coil

Positive Array

Unit Cooler Defrosting

Causes of frosting

#1. Incorrect installation Position

If unit cooler is installed above the Cold Room Door. Once you open the door, the hot air outside the cold room is directly sucked into the inside of the unit cooler, and the water vapor is also condensed on the cooler housing and the fan grille.

Unit cooler frost-with arrow

#2. Higher relative humidity (RH)

The cold room door will frequently open and close when discharge the goods. Because the door is long time opened resulting in the continuous intrusion of huge external hot air into the cold room.

#3. Incomplete defrosting

Due to the insufficient defrosting time and the unreasonable position of the defrosting reset probe, the evaporator will be turned on when the defrosting is incomplete, and the partial frost layer of the evaporator will become icing after several cycles finally become larger and larger.

Defrosting Ways

#1. Manual defrositing

Pay attention to safety first during the manual defrosting process, do not damage the refrigeration equipment.

#2. Water defrosting

Pouring water on the evaporator surface, then the temperature of the evaporator rises, forcing the frost attached to the evaporator surface to melt. This way is carried outside the evaporator, so must treat well the waterflow in the process to avoid affecting the normal use of the refrigeration equipment.

Unit cooler - side cooling

#3. Electric heating defrosting
Install electric heating tubes or heating wires inside the unit cooler fins to defrost by the current thermal effect. This way can intelligently control the defrosting through a micro-computer controller, which can greatly reduce labor time and cost.

#4. Thermal fluid defrosting
Use the refrigerant vapor (with higher temperature) discharged from the compressor to enter the evaporator after passing through the oil separator, meanwhile use the released heat  when the thermal fluid is condensed to melt the frost on the evaporator.

Unit Cooler Cooling Capacity Calculation

Do you know how to select the correct unit cooler cooling capacity for your cold room?

Chiller Cold Room

The load per cubic meter (m3) is calculated as 75W

#1. If cold room Volume < 30m3, multiply by factor A=1.2

For example: Cold room volume is 90m3, so you need to choose unit cooler cooling capacity: 90 x 75 x 1.2=8,100W

#2.If 30m3≤Volume<100m3, multiply by factor A=1.1

#3. If Volume≥100m3, multiply the factor A=1.0

Freezer Cold Room

The load per cubic meter (m3) is calculated as 70W

#1. If cold room Volume < 30m3, multiply by factor A=1.2

For example: Cold room volume is 90m3, so you need to choose unit cooler cooling capacity: 90 x 70 x 1.2=7,560W

#2.If 30m3≤Volume<100m3, multiply by factor A=1.1

#3. If Volume≥100m3, multiply the factor A=1.0

Unit Cooler Installation

# Installation Rules:

1. Airflow should cover the entire room.

2. Forbidden to install the unit cooler above the door.

3. Aisles and shelves shouldn’t block the passage of air supply & return air.

4. The piping distance from the unit cooler to the compressor should be the shortest.

5. Keep the distance to the drain pipe the shortest.

# Installation distance:

“S1” – The distance between the wall and the unit cooler coil is >500mm.

“S2” – For ease of maintenance, the distance from the wall to the terminal plate shall be >400mm.

Unit cooler installation 01

Unit Cooler Installation Position 01

A) Preferred Position

B) The 2nd choice, because the air outlet is facing the door

C) Preferred Position

D) The 2nd choice, same like B)

Unit Cooler Installation Position 02

All unit coolers can’t be installed on the same side wall !

Unit cooler installation 02

(1) Preferred Position

(2) The 2nd choice, because the air may collide each other or affect the defrosting effect

Unit Cooler Types

Unit Cooler - 01

Unit Cooler ( Wall Mounted)


#1. High-level steel/stainless steel/aluminum housing, electrostatic spray surface, anti-corrosion.

#2. High-quality stainless steel electric heating tube is evenly distributed in the coil, good defrosting effect.

#3. Double water tray to prevent the water tray from freezing.

#4. Customized size, shape and color.

Unit cooler - ceiling type

Unit Cooler (Ceiling Mounted)


#1. Stainless steel U-shaped tubular electric heating tube with strong insulation, short defrosting time and good effect.

#2. External-rotating low temp motor, double side and soft blowing, , low noise.

#3. Copper tube is tightly bonded with the aluminum fins, perfect heat exchange effect.

#4. Customized size, shape and color.

Unit cooler (side type with sleeve)

Unit Cooler (Wall Mounted With Nozzle)


#1. High-level steel/stainless steel/aluminum housing, electrostatic spray surface, anti-corrosion, each axial fan with nozzle.

#2. High-quality stainless steel electric heating tube is evenly distributed in the coil, good defrosting effect.

#3. Double water tray to prevent the water tray from freezing.

#4. Customized size, shape and color.

Unit cooler - double row

Unit Cooler (Floor Mounted)


#1. Double exhaust air outlet, double wind power, speed up cooling

#2. Tested at 2.875 MPa to ensure high air tightness.

#3. Optional explosion-proof motor, decontamination treatment to ensure the whole refrigeration system cleanliness.

#4. Customized size, shape and color.

Qualified Unit Cooler Checklist


The size of unit cooler should be appropriate for the cold room size. It’s important to choose a unit cooler that can effectively cool the entire space.


The capacity of unit cooler should be sufficient for the cooling requirements of the cold room. This will depend on factors such as the cold room size, the temperature requirements, and the products being stored.


There are different configurations of unit coolers available, such as ceiling mounted, wall mounted, and floor mounted. The choice will depend on the layout of the cold room and the space available.

Refrigeration Evaporators

#4. Airflow

Unit cooler should have a high airflow rate to ensure proper cooling and temperature control. Unit cooler design should ensure the airflow is distributed evenly throughout the cold room.

#5. Efficiency

Unit cooler should be energy efficient to minimize operating costs. Look for features such as high-efficiency fan motors, low noise levels, and advanced controls that optimize energy use.

#6. Maintenance

Unit cooler should be easy to maintain, with accessible components for cleaning and replacement. Consider features such as removable panels, easy-to-clean coils, and corrosion-resistant materials.

unit cooler -002

#7. Durability

Unit cooler should be built to last, with robust materials and a reliable design. Look for features such as heavy-duty fan blades, corrosion-resistant coatings, and high-quality components.

#8. Brand and warranty

Choose a reputable brand with a good track record of quality and reliability. Make sure the unit cooler comes with a warranty that provides adequate protection against defects and malfunctions.

Why Choose Our Unit Cooler ?

#1. Adopt European advanced technology, product performance is more scientific and superior.

#2. The outer casing of unit cooler is made of electrostatically sprayed steel plate, aluminum plate or stainless steel plate, which is anti-corrosion and rust-proof.

#3. Use internal threaded copper tubes, and special tube spacing & heat exchange technology to improve energy efficiency.

Cold room faults 1

#4. The fin stamping equipment adopts international advanced molds, and no holes are reserved for places without electric heating pipes, which can improve the heat exchange size and reduces the wind resistance.

#5. The fin bottom is with a wind-shielding and water-receiving plate to prevent the wind from passing through the water tray, so that more wind can pass through the fin and obtain greater heat exchange.

#6. Our unit coolers provide effective temperature control, allowing for precise temperature management and preservation of products.

#7. With pressure gauge interface, which can detect the pressure and adjust the performance of the evaporator in real time.

#8. With imported brand (optional) stainless steel electric heating tube to make the evaporator defrost quickly and efficiently.

Cold room evaporator

#9. The drip water tray can be swivelled open for easy inspection and maintenance.

#10. Our unit cooler is compact design, safe and reliable in structure, saves space, and significantly reduces the amount of refrigerant. Medium and large size unit coolers have supporting legs for easy transportation and on-site hoisting.

The FAQs

Frequently Asked Questions About Unit Cooler

A unit cooler is designed to remove heat from the air or a specific space and transfer it to the refrigerant, thus facilitating cooling or freezing of the surrounding environment in refrigeration or air conditioning systems.

A unit cooler operates by circulating refrigerant through its coils. As air is blown over the coils by a fan, the refrigerant absorbs heat from the air, causing it to evaporate and cool the surrounding environment.

Speedway is committed to quality across all aspects of our business – our people, processes and products. We call this ‘the SPEEDWAY  standard’.

We welcome any sample order before big quantity purchase, that means 1pc is acceptable. More than 20pcs we will give discount.

Unit coolers are commonly used in walk-in coolers, freezers, cold rooms, refrigerated display cases, food processing equipments, warehouses, and other commercial and industrial settings where need temperature control.

We have own factory to produce the main refrigeration products, but we also do trading for other related products because we have resource to supply good quality and service.

Yes, unit coolers can be designed to be energy-efficient. Manufacturers often incorporate features like high-efficiency fan motors, advanced coil designs, and improved insulation to enhance energy savings and reduce operating costs.

Yes,we have 3 senior engineers, 10 professional r & D team, 55 professional production personnel.

We support payment through wire transfer, like T/T, L/C, Western Union. Also accpet Paypal payment for sample piece order.

For sure. You can send us your logo, package or panel design, we will give you the final satisfied solution accordingly without additional cost !

Signs of potential problems with unit coolers include reduced cooling capacity, inadequate airflow, ice formation on the coils, unusual noises, and increased energy consumption. If have any of these signs, it’s advisable to have a professional technician inspect the unit cooler.

Yes, unit coolers can be used for both cooling and freezing applications. The temperature range and the design of the unit cooler may vary depending on the specific application requirements.

Yes, unit coolers can be designed to work with various types of refrigerants, depending on the specific requirements and regulations. Common refrigerants include R22/404/448/449.., and natural refrigerants such as ammonia (R717) and carbon dioxide (R744).

Yes, we did. Our factory has inner 100% inspection for each unit before loading, also can make the legal test report for each shippment. What’s more, can invite SGS / TUV / BV inspection according clients’ request, but customers should pay for the test fee.

The lifespan of a unit cooler can vary depending on factors such as the quality of the unit, operating conditions, and maintenance practices. Generally, with proper installation and regular maintenance, unit coolers can last anywhere 10 ~ 20 years or more.

First, we need starting the business to understand each other, if things move smoothly and you meet our “distributor request”, then we will sign the formal contract and agreement to ensure your rights in your market.

Contact our salesman for more details please.

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