Equipment Guide

Commercial Walk-In Coolers & Freezers

This guide covers everything you need to know about choosing, installing, and maintaining a commercial walk-in cooler or freezer. A walk-in is one of the largest investments a food service operation makes, and getting it right the first time saves significant time and money down the road.

Section 1: How To Choose The Right Walk-In

The right walk-in depends on your volume, your menu, and how your operation is laid out. Getting the size wrong in either direction creates real problems.

1. Calculate Your Storage Needs

A common industry rule is 1 to 1.5 cubic feet of refrigerated storage per meal served per day.

  • A restaurant serving 100 meals per day needs roughly 100 to 150 cubic feet of usable space.
  • Always account for shelving. Shelving typically reduces usable cubic footage by 60 to 70%, so a 200 cubic foot box gives you roughly 120 to 140 cubic feet of actual shelf space.

Pro Tip: Size your walk-in for where you want to be in two to three years, not where you are today. Expanding a walk-in after installation is expensive.

2. Cooler vs. Freezer vs. Combination

  • Walk-in coolers operate between 35°F and 41°F and are used for produce, dairy, beverages, and prepared foods.
  • Walk-in freezers operate between 0°F and 10°F and are used for frozen proteins, ice cream, and long-term storage.
  • Combination units have a shared wall separating a cooler section from a freezer section, which saves floor space in smaller kitchens.

3. Indoor vs. Outdoor Installation

  • Indoor units are installed inside the building and are the most common configuration for restaurants.
  • Outdoor units are self-contained structures placed outside the building, often used by larger operations that need high-capacity storage without sacrificing interior kitchen space.

4. Panel Thickness

Panel insulation is measured in inches and directly affects energy efficiency and holding temperature.

  • 4 inch panels: Standard for coolers in most commercial applications.
  • 5 inch panels: Recommended for freezers or for coolers in hot climates.

Section 2: Installation Requirements

A walk-in installation involves your floor, your refrigeration system, your electrical supply, and your drainage. All four need to be addressed before the unit is delivered.

1. Floor and Foundation

  • The floor under your walk-in must be level and capable of supporting the combined weight of the unit, shelving, and product. Most fully loaded walk-ins exceed 2,000 lbs.
  • Indoor walk-ins typically use insulated floor panels that raise the floor 4 to 6 inches. Ensure your staff can safely step up into the unit and that any hand trucks or dollies can clear the threshold.
  • Outdoor walk-ins require a concrete pad poured to the manufacturer's specifications.

2. Refrigeration System

Walk-ins use either a self-contained refrigeration unit or a remote condensing unit.

  • Self-contained units: The compressor and condenser are mounted directly on the walk-in, usually on top. Easier to install but generate heat inside the kitchen.
  • Remote condensing units: The compressor is located outside or in a mechanical room, which keeps heat out of the kitchen. Requires refrigerant line sets to be run by a certified refrigeration technician.

3. Electrical Requirements

  • Most walk-in coolers operate on 115V or 208/240V single-phase power.
  • Walk-in freezers and larger combination units often require 208/240V three-phase power.

Pro Tip: Always have your electrician confirm available voltage and amperage before ordering. Mismatched power supply is one of the most common and most avoidable installation errors.

4. Drainage

  • Coolers require a floor drain inside the unit for cleaning and condensate.
  • Freezers typically use an electric drain pan heater to prevent ice buildup at the evaporator drain.
  • Ensure the drain line is properly sloped and not blocked before the unit is put into service.

Section 3: How to Operate Your Walk-In

1. Initial Start-Up

Before loading any product, allow the unit to run empty and reach its target temperature.

  • Coolers: Allow 4 to 6 hours to pull down to operating temperature before loading.
  • Freezers: Allow 12 to 24 hours to reach operating temperature before loading.
  • Check the thermometer inside the unit and confirm it matches the controller setpoint before adding any product.

2. Loading the Unit

How you load the walk-in directly affects airflow and temperature consistency.

  • Never block the evaporator coil or the air return. Airflow needs to circulate freely throughout the entire unit.
  • Store raw proteins on the lowest shelves, below ready-to-eat foods, always.
  • Do not push product flush against the walls. Leave at least 2 to 3 inches of clearance for air to circulate.
  • Avoid bringing large quantities of warm product in at once. This forces the compressor to work harder and can temporarily raise the internal temperature into the unsafe zone.

3. Best Practices for Daily Use

  • Keep the door closed as much as possible. Every time the door opens, warm humid air enters the unit and the compressor has to compensate.
  • Check the door gaskets regularly. A gasket that does not seal properly is one of the most common causes of elevated energy bills and inconsistent temperatures.
  • Log internal temperatures at least twice per day. This is a food safety requirement in most jurisdictions and gives you an early warning if the refrigeration system is starting to struggle.

4. Monitoring the System

Pay attention to any changes in how the unit sounds and performs day to day. Common warning signs include:

  • Ice buildup on the evaporator coil: Usually indicates a defrost issue or a refrigerant leak.
  • Compressor running constantly without reaching setpoint: Can indicate low refrigerant, a dirty condenser coil, or a failing compressor.
  • Condensation on the exterior panels: Often a sign of a damaged or missing panel gasket allowing warm air to penetrate the insulation.