Whether you are opening a new restaurant, expanding a butchery, setting up a commercial kitchen, or upgrading ageing refrigeration equipment, one of the most important decisions you will face is choosing the right cold storage. Walk-in chillers and walk-in freezers serve fundamentally different purposes, and selecting the wrong type, or the wrong size, can lead to food safety issues, wasted energy, spoiled stock, and unnecessary expense.
This guide covers the key differences between walk-in chillers and walk-in freezers, how to determine which one your business needs, how to size it correctly, and what to look for when choosing a provider in New Zealand.
Understanding the Difference: Chiller vs Freezer
The distinction between a walk-in chiller and a walk-in freezer comes down to temperature.
A walk-in chiller (also called a coolroom) maintains an internal temperature between 0°C and 5°C. It is designed for short-to-medium-term storage of fresh, perishable goods, think fresh produce, dairy, beverages, cut flowers, prepared meals, deli items, and fresh meat. In New Zealand, food safety regulations under the Food Act 2014 require that potentially hazardous chilled food be stored at 5°C or below.
A walk-in freezer operates at -18°C or below and is built for long-term storage of frozen goods. The insulation is thicker (typically 100–150mm compared to 75–100mm for a chiller), the refrigeration unit is more powerful, and the construction must withstand the stresses of sub-zero temperatures, including floor heaters to prevent frost heave on concrete slabs. Freezers are essential for businesses that store bulk proteins, frozen seafood, ice cream, pastry, or any product requiring a maintained frozen state.
Some businesses need both. A restaurant with a large menu, a butchery that processes and freezes product, or a caterer managing both fresh and frozen inventory will often require a chiller and a freezer operating side by side. In other cases, a combination unit with separate chiller and freezer compartments within a single structure can be a practical, space-efficient solution.
Which Type Does Your Business Need?
The right answer depends on what you store, how much you store, and how quickly you turn over stock.
You Likely Need a Walk-In Chiller If:
Your business primarily handles fresh produce, dairy, beverages, or prepared food that needs to be kept cold but not frozen. Restaurants, cafés, florists, breweries, grocery stores, and fresh food distributors typically fall into this category. A chiller is also essential for any business that receives regular deliveries and needs short-term cold storage to bridge the gap between delivery and use.
If you are a small-to-medium restaurant turning over fresh ingredients daily, a well-sized walk-in chiller may be all you need, potentially supplemented by a standard commercial freezer for a modest amount of frozen stock.
You Likely Need a Walk-In Freezer If:
Your business stores significant quantities of frozen products for extended periods. Butcheries that process and freeze meat in bulk, seafood distributors, ice cream manufacturers, large-scale caterers who batch-cook and freeze meals, and food manufacturers all rely on walk-in freezers as core infrastructure.
A good rule of thumb: if more than 30–40% of your inventory is frozen, a dedicated walk-in freezer is almost certainly more efficient and safer than relying on stand-alone chest or upright freezers.
You Likely Need Both If:
Your operation handles a high volume of both fresh and frozen products. Large restaurants, hotel kitchens, wholesale food distributors, and butcheries with retail counters often need separate chiller and freezer rooms to manage their inventory effectively and maintain compliance with New Zealand food safety standards.
Installation Considerations
Before committing to a purchase, it is worth thinking through the practical aspects of installation.
Location and access. Your coolroom needs to be positioned away from direct sunlight and heat sources, with adequate ventilation around the condensing unit. There must be enough clearance for the door to open fully and for staff to move stock in and out comfortably.
Floor and foundations. Walk-in cool rooms and freezers are heavy. Ensure the floor or slab where the unit will sit can support the combined weight of the room, the refrigeration equipment, and a full load of stock. For freezer rooms, a floor heater or insulated floor system is necessary to prevent frost heave on concrete.
Power supply. Most standard walk-in chillers and freezers operate on single-phase 15-amp or 20-amp circuits. Larger commercial units may require three-phase power. A licensed electrician should handle the connection to ensure compliance with New Zealand electrical standards.
Drainage. Coolrooms generate condensation, and freezers produce melt water during defrost cycles. A properly installed drain with appropriate fall prevents water pooling and hygiene issues.