What is a Cold Storage Room?
A cold storage room, also known as a cold room or walk-in cold room, is a large space insulated with thick polyurethane foam panels to block outside heat and uses a refrigeration system to control temperature and maintain stable storage conditions for perishable goods, preventing spoilage.
It mainly slows biological, chemical, and microbial activity to preserve product quality and extend shelf life.
A cold storage room commonly operates at positive, negative, and deep-freezing temperatures and is used in food, medical, industrial, floral, and agricultural applications.
Please read our detailed information guide, “What is a Cold Room,” to learn more.
Now, to select the best cold room storage, you need to understand different types of cold rooms, which are commonly classified by application, storage temperature, capacity, and structural design.
What are the Types of Cold Rooms?
Based on the type of cold room indoor unit
- Rack Cold Room
- Air-Cooled Cold Room
- Pipe-Type Cold Room
By application
- Food Cold Room
- Meat Cold Room
- Kitchen Cold Room
- Seafood Cold Room
- Vegetable and Fruit Cold Room
- Cold Chain Cold Room
- Logistics Cold Room
- Pharmaceutical Cold Room
- Vaccine Cold Room
By capacity
- Small Cold Room
- Medium Cold Room
- Large Cold Room
According to the cold storage structure
- Monoblock Cold Room
- Combined Cold Storage
- Glass Door Cold Room
- Container Cold Room
To learn more classifications and selection guidance, please read our “Types of Cold Rooms” guide.
What is a Cold Room Used for?
Here are some of the most common industries that rely on temperature-controlled storage to preserve product quality and safety:
- Cold Room for Food Storage (Food Manufacturing & Preserving Factories)
- Cold Room for Hospitals (Laboratories, Medical Samples, Drug & Vaccine Storage)
- Cold Room for Fruits and Vegetables (Keep Fresh & Delay Ripening)
- Cold Room for Cold Chain (Logistics Company’s Transit & Distribution)
- Cold Room for Industrial Storage (Pharmaceutical Companies & Chemical Plants)
- Cold Room for Commercial Use (Restaurants & Supermarkets)
What is the Temperature and Humidity of Cold Room Storage?
Cold room temperature and humidity depend on the product being stored, and its performance depends directly on how precisely temperature and humidity are managed.
Based on the operating temperature, cold storage units are generally divided into three primary categories.
Fresh Cold Storage / Refrigerated Storage (0°C to 18°C): Designed for fresh items, preserving them for temporary or everyday storage without freezing.
Frozen Cold Room (-18°C): Designed for long-term storage while preserving product texture and safety against bacterial activity.
Low-Temperature Quick-Freezing Storage (-30°C): Designed to deep freeze to maintain nutrient integrity and prevent cell structure damage.
As a professional cold storage solution provider based in China, Miracle brings extensive experience in configuring and controlling precise humidity and temperature settings for custom cold storage projects.
For any commercial, industrial, or customized cold storage needs, please contact us now.
Cold Storage for Mushroom
It maintains 0°C-4°C for standard mushroom storage, with specific variants like Shiitake at 1°C–3°C, Enoki and King Oyster at 2°C–4°C, and Oyster at 3°C–4°C.
It requires 80–90% relative humidity to preserve freshness, texture, and food safety. Learn more about Miracle Mushroom Cold Storage.
Cold Storage for Dairy
For general items like milk, butter, yogurt, and cheese, it maintains a temperature of 2°C to 10°C and a relative humidity of 80–90%.
It utilizes -1°C to 0°C for supermarket storage and can bring 40°C down to 4°C in factories for rapid cooling systems. Check out our Miracle Dairy Cold Storage.
Cold Storage for Ice Cream
It maintains sub-zero temperatures from -18°C down to -30°C to prevent ice cream from melting.
Miracle Ice Cream cold rooms use Bitzer medium-temperature units for -18°C, or low-temperature air-cooled condensing units for -25°C and -30°C, depending on storage needs. Learn more about our Ice Cream Cold Room.
Cold Storage for Fruits and Vegetables
It maintains 0°C to 2°C for leafy vegetables and fruits, 7°C to 10°C for citrus, and 12°C to 15°C for sensitive items like bananas and tomatoes.
It operates at a high humidity of 90% to 95% RH. Read our full Miracle Fruits and Vegetables Cold Storage Guide.
Cold Storage for Flowers
It stores fresh flowers at 1°C to 3°C, with a controlled humidity range of 60% to 85%, to protect the petals, keep floral arrangements fresh, and maximize shelf life up to 7 days. Learn more about flower cold storage.
Cold Storage for Meat
It commonly operates at 0°C to 1°C for fresh beef, -18°C for standard freezing (including chicken storage), and utilizes deep sub-zero ranges of -23°C to -30°C for long-term frozen preservation.
It uses moderate humidity to lock in quality. Get full system details at Miracle Meat Cold Storage.
Cold Storage for Fish (Seafood)
It operates at 0°C for fresh fish, requires a deep-freezing processing temperature of -30°C for frozen fish storage, and an ultra-low temperature of -60°C for deep-freezing tuna.
It maintains 90-95% relative humidity to preserve quality. Find specialized solutions at Miracle Seafood Cold Storage.
Cold Storage for Onion
It requires a temperature of 0°C to 2°C for long-term onion storage, extending to 0°C to 3°C, and a relative humidity of 60% to 70% to prevent sprouting, decay, and moisture loss. Learn more about our Miracle Onion Cold Storage.
Cold Storage for Tomato
It maintains a temperature range of 10°C to 13°C and 85% to 90% humidity for storing tomatoes.
Mature green tomatoes require 12.5°C to 15°C to prevent chilling injury, and 7°C to 10°C to maintain firm-ripe fruit and protect flavour profiles. Get other specifications at Miracle Tomato Cold Storage.
Cold Storage for Potato
It maintains a stable temperature range of 3°C to 7°C and a relative humidity of 90% to 95%.
It ensures sprouting is slow, moisture loss is minimized, and prevents microbial spoilage or shrinkage completely, even when stored for months. Learn more in the Miracle Potato Cold Storage Guide.
Cold Storage for Apple
It commonly maintains a stable temperature of 0°C to 4°C and a high humidity of 90% to 95% to preserve crisp texture and flavour. If stored for a long time, it also prevents the skin from shrivelling and maintains freshness.
Cold Storage for Banana
Its ideal operating holding temperature is 13°C to 14°C to successfully delay ripening and prevent chilling damage.
The general storage baseline is 11°C to 13°C, and during the ripening phase, it is 20°C to 25°C. It maintains a relative humidity of 90% to 95% to preserve peel integrity. Learn more in Miracle Banana Cold Storage.
Cold Storage for Medicine
This cold storage operates under GDP and GMP standards, maintaining a strict temperature range of 2°C to 8°C to preserve product potency and a relative humidity range of 45% to 65% to protect packaging and prevent moisture degradation. Check out Miracle Medicine Cold Storage.
Cold Storage for Vaccines:
It also uses a 2°C to 8°C temperature range for ordinary vaccines and a freezing target of -20°C for specialized vaccines.
Typically, use a dual refrigeration system for 24-hour backup protection. Please read more technical information in Miracle Vaccine Cold Storage
What Parts of the Cold Room?
A reliable cold room refrigeration system consists of high-quality structural components, refrigeration equipment, and control devices that work together to maintain stable temperature and humidity. Here are the essential parts of a professional cold room setup:
Cold Room Refrigeration Unit
This central cooling system is engineered for high-, medium-, and low-temperature or quick-freezer installations, with customized sizing and optional remote electronic control modules. Check system parameters at the Miracle Cold Room Refrigeration Unit.
Cold Room Condensing Unit (Outdoor Unit)
The outdoor unit compresses refrigerant and rejects heat via the condenser and compressor outside the facility. Check system parameters at the Miracle Condensing Unit.
Cold Room Evaporator (Indoor Unit)
This functions as the primary heat exchanger, located inside the cold room. It absorbs heat from the stored space and distributes cold air evenly. Check system parameters at Miracle Cold Room Evaporator.
Cold Room Door
It is a heavily polyurethane-insulated, food-grade, manual or automatic sliding barrier with thermal break technology. It minimizes cold-air loss and air leakage and blocks external thermal entry points during operations. Learn more at Miracle Cold Room Door Manufacturer.
Check hinged cold room doors and sliding doors for more details.
Cold Room Door Hinge
It is a high-density insulation material industrial mechanical hardware that supports heavy insulated doors, smooth opening and closing, ensuring long-term stability, perfect alignment, airtight closing, and reliable sealing.
Cold Room Door Handle
Its latching mechanism, made from durable stainless steel, features an inner push-latch that allows a person to safely unlock and push open the door from the inside without tools.
It maintains airtight door seals while preventing accidental walk-in lock-ins.
Cold Room Panel
Made of certified modular sandwich insulation blocks, fire-retardant panels feature cam-lock joints. It establishes the structural walls, ceiling, airtight seals, and floor thermal boundaries. Learn more at Miracle Cold Room Panels.
Cold Room Compressor
The compressor in a cold room pumps, compresses, and circulates high-pressure refrigerant gas throughout the closed loop and serves as the core power source of the refrigeration system. Learn more at Miracle cold room compressor.
Cold Room Expansion Valve (Alco expansion valve)
It regulates and meters the flow rate of pressurized liquid refrigerants into the evaporator, creating the necessary pressure drop to trigger chilling and ensuring stable system performance. Learn more at Miracle Expansion Valve.
Cold Room Axial Fan
It is a heavy-duty air-moving fan motor that forces targeted airflow across the condenser or evaporator coil to optimize heat transfer efficiency. Check more details in the Miracle AC Axial fan supplier.
Cold Room Control System
It is a centralized electrical management and thermostat system that monitors and controls temperature, defrost cycles, humidity, alarms, and the overall operation of the refrigeration system.
It works as a secondary thermal separation barrier, located across open doorways, reducing cold air loss during door opening and blocking outside hot air while staff moves cold room space in and out. Learn more about Miracle PVC Strip Curtains.
To get a complete overview of refrigeration components and selection guidance, read the “Cold Room Equipment List – A Complete Guide,” or contact us to get expert support.
What Is the Right Equipment for a Cold Storage Room?
Selecting the right cold storage room equipment isn’t based solely on room size.
It depends on many other factors. All of these need to be considered to ensure reliable performance, energy efficiency, and long-term operation costs.
When selecting cold room equipment, consider the following:
- Cold Room Capacity: The room’s total volume indicates the required horsepower and the airflow throw distance needed to maintain uniform temperatures.
- Required Storage Temperature: The operating ranges will be fresh preservation, freezing, or ultra-low blast freezing, which determines whether the cold storage room equipment requires single-stage or low-temperature specialization.
- Cold Room Type: How the cold storage refrigeration system will be mounted in the room depends on the architectural style, whether it is modular cam-lock rooms, walk-in glass displays, or rugged container units.
- Stored Product Type: A product’s required head-load calculations depend on its respiration rate, packaging method, and initial loading temperature.
Our Recommendations:
For a large, Low-temperature Cold Room: We highly recommend using a parallel condensing unit system paired with an evaporative condenser setup. A centralized parallel compressor system can improve energy efficiency, reduce overall energy consumption, and lower upfront capital costs while providing better capacity control.
For Small, Multiple Cold Room Projects: We suggest deploying split refrigeration equipment modules. Though it needs a sufficient outdoor footprint and installation space, it offers high reliability and easier maintenance.
For a detailed equipment selection guide, including refrigeration units, compressors, evaporators, condensing units, controllers, and system matching, please read our blog Cold Room Equipment List – A Complete Guide.
What Factors Determine the Price of a Cold Room?
Calculating the total financial cost of a cold room not just depends on its size and configuration, but also depends on
- Refrigeration Equipment
- Insulated Cold Room Panels
- Cold Room Doors
- Logistics And Transportation
- Import Duties & Tariffs
- Financial Cost (Loan Interest)
- Site Preparation
- Installation
- And Long-Term Operational Costs, Such As Electricity And Maintenance.
How To Achieve Reasonable Cost Savings?
- Optimize Thermal Thickness Upfront: Investing slightly more in thicker, high-density insulation panels vastly minimizes daily thermal heat leakage, reducing the compressor’s total runtime and cutting monthly electricity bills by 15% to 20%.
- Choose the Correct Size: Avoid purchasing oversize compressors based on guesswork; talk with experts before buying, and get an exact heat load calculation for your specific product.
- Use Intelligent Night Chilling: Since night hours are cooler, program refrigeration cycles to drop the temperature slightly at night, reducing ambient temperature and lowering peak-hour utility rates.
- Use PVC Strip Curtains: Hanging simple, low-temperature PVC strip barriers costs very little but dramatically traps hot air outside, protecting your inventory from temperature rise.
Get a Cost-Effective Solution with Miracle
When you contact Miracle, you skip all middlemen and unnecessary distributor markup and connect with a one-stop cold storage supplier in China.
We independently design and manufacture cold room refrigeration equipment, insulated cold room panels, and cold room doors.
We also provide engineering design, installation guidance, and technical support.
By integrating manufacturing with comprehensive project services, we help customers reduce costs and obtain factory-direct, cost-effective cold storage solutions for their businesses.
Contact our engineering and support team today to get an accurate line-item quote for your next installation.
What Size Cold Room Is Right for You?
Choosing the right cold room size reduces equipment investment, power consumption, and operating cost. The ideal size depends on your storage volume, product type, and other factors:
Small Modular Cold Rooms
These are best for restaurants, cafés, convenience stores, florists, pharmacies, laboratories, and small food processors that require compact, quick assembly, and low-cost storage for small volumes of fresh produce.
Mid-Size Walk-In Rooms
These cold rooms are best suited for supermarkets, hotels, central kitchens, hospitals, food distributors, and medium-sized processing facilities that require larger storage capacity, efficient workflows, and separate chilled or frozen storage areas.
Large Custom Cold Storage
This cold room is best suited for massive logistics centers, food manufacturing plants, cold chain warehouses, pharmaceutical factories, seafood and meat processing facilities, and pharmaceutical facilities requiring customized layouts, high-capacity refrigeration, and scalable operations.
What Temperature of Cold Room Is Right for You?
Selecting the correct storage temperature is as essential as other criteria.
0°C Cold Room Is Best For
Preserving fresh meat, seafood, dairy products, fruits, eggs, vegetables, flowers, and other chilled products that require freshness without freezing or moisture loss while maintaining high quality and shelf life.
-18°C Cold Room Is Best For
Long-term storage of frozen meat, chicken, pork, beef, seafood, poultry, vegetables, prepared meals, and most frozen foods requires meeting standard food safety and cold chain requirements.
-25°C Cold Room Is Best For
Storing premium frozen foods, ice cream, high-value seafood, and products requiring longer storage periods with stricter temperature control and reduced quality deterioration, without preventing crystals from damaging product texture.
-35°C Cold Room Is Best For
Blast-freezing fresh seafood, meat, bakery products, and prepared foods, where rapid freezing minimizes ice crystal formation and preserves texture, flavour, and nutritional value.
-60°C Cold Room Is Best For
Ultra-low-temperature storage of pharmaceutical products, high-value premium tuna, vaccines, biological samples, laboratory materials, and specialty seafood requires maximum preservation and the prevention of spoilage of sensitive chemical items.