Top coil refrigerated display cases are known for their consistent refrigeration performance and flexible merchandising. These refrigerated display cases feature the evaporator coil at the top, promoting even airflow, enhanced product visibility, and maximum shelf life—all key advantages for store managers looking to improve product presentation and profitability.

In this blog, we will explore the advantages of top coil refrigerated display cases and how to use them to your advantage.

What is the Cold Chain

The cold chain is a vital part of modern logistics. It is a process to ensure that temperature-sensitive products, such as food and pharmaceuticals, remain safe, stable, and effective throughout their production, storage, and delivery. It involves a continuous sequence of temperature-controlled processes and specialized equipment designed to maintain product integrity from origin to end use.

The Importance of the Cold Chain

Multiple industries rely on proper procedures. In the food and beverage sector, the cold chain preserves freshness and nutritional value in perishable items such as dairy, meat, produce, and frozen goods. In healthcare, it safeguards the potency of vaccines, biologics, and temperature-sensitive medications. The chemical industry also relies on the cold chain to ensure quality control for sensitive materials that degrade with temperature fluctuations.

Key Components

A successful cold chain consists of four major stages:

• Production: Temperature-sensitive products must be properly handled immediately after harvest or manufacture. Maintaining the correct environment from the start helps preserve product safety and quality.
• Storage: Once produced, items are stored in refrigerated environments—ranging from cold rooms to large-scale refrigerated warehouses. These spaces can be equipped with temperature monitoring and backup systems to maintain consistency.
• Transportation: Specialized vehicles such as refrigerated trucks, containers, and air or sea freight systems ensure goods remain within specified temperature ranges throughout transit.
• Distribution: The final step delivers products to retailers, foodservice locations, pharmacies, and other establishments that serve end-users. Cold chain integrity must be upheld through last-mile delivery and in-store refrigeration systems.

Refrigeration is changing—fast. As environmental regulations tighten and companies seek more sustainable options, A2L refrigerants are stepping into the spotlight. Just as life in the desert has adapted to thrive under pressure, these new refrigerants are the refrigeration industry’s response to a changing climate and regulatory environment. These newer refrigerants are making it easier for businesses to stay ahead of regulations and reduce their carbon footprint.

So, what exactly are A2Ls?

Let’s break it down.

CO₂ refrigeration systems are becoming the go-to modern, eco-friendly solution because environmental regulations are tightening, and as a result, energy efficiency is taking priority in commercial and industrial refrigeration operations. However, CO₂ refrigerant systems aren’t just a drop-in replacement for traditional refrigerants. Instead, they come with a unique set of considerations that ultimately impact performance, reliability, and long-term ROI.

In this blog, we’ll break down the basics of CO₂ (carbon dioxide) refrigeration in clear, practical terms. Whether you’re upgrading equipment, building a new facility, or exploring sustainable refrigeration options, this guide will help you understand what makes CO₂ systems different—and how to maximize their potential in your operation.

Why Choose CO₂ as a Refrigerant?

CO₂, also known as refrigerant R-744, is gaining momentum in the refrigeration industry for good reason:

• Low Environmental Impact: CO₂ has a Global Warming Potential (GWP) of just 1. In contrast, traditional refrigerants like R-404A have a GWP over 3,900.
• High Energy Efficiency: In the right conditions, CO₂ systems can outperform conventional refrigeration systems, particularly in cooler climates.
• Regulatory Compliance: CO₂ systems future-proof your facility by aligning with evolving environmental and refrigerant phase-down regulations.

However, CO₂ is not without its challenges. Specifically, system design, pressure management, and climate adaptability require careful consideration.

Key Differences: How CO₂ Refrigeration Systems Operate

CO₂ refrigeration systems function differently than traditional systems, and understanding these differences is key for informed decision-making.

• Higher Operating Pressures

  • CO₂ operates at much higher pressures than other refrigerants. Although this might sound alarming, today’s systems are built with specialized components designed to handle these conditions safely and reliably. Proper engineering and installation are essential.

• Two Modes of Operation: Subcritical and Transcritical

  • Subcritical Mode: In cooler climates or during colder months, CO₂ behaves like traditional refrigerants—operating at manageable pressures with efficient heat exchange.
  • Transcritical Mode: In warmer environments, CO₂ enters a supercritical state, where it no longer behaves as a typical liquid or gas. This mode requires more advanced system controls and heat rejection strategies to maintain efficiency.

• Unique Thermodynamic Properties

  • CO₂ has a triple point and critical point that impact system design. These characteristics influence how heat is removed and, furthermore, how pressure is managed across the system, particularly in variable climates.
  • Triple Point: The temperature and pressure where CO₂ can exist as a solid, liquid, and gas.
  • Critical Point: The temperature where CO₂ becomes a supercritical fluid.

Commercial Refrigeration and the AIM Act

The American Innovation and Manufacturing (AIM) Act, enacted in December 2020, has brought significant changes to the commercial refrigeration industry. As we navigate through 2025, the first set of restrictions under the AIM Act are now in effect. These restrictions aim to phase down the production and consumption of hydrofluorocarbons (HFCs) by 85% by 2036. Consequently, these regulations are crucial for reducing greenhouse gas emissions and transitioning to more environmentally friendly refrigerants.

Technology Transition Rule

One of the key aspects of the AIM Act is the Technology Transition Rule, which impacts the repair and servicing of refrigerated display cases. The rule specifies that repairs are permissible unless they result in the creation of a new system. Therefore, while existing display cases can continue to operate and be serviced, certain extensive repairs may be restricted. For instance, assembling a system for the first time from used or new components, increasing the cooling capacity of an existing system, or replacing 75% or more of evaporators and 100% of the compressor racks, condensers, and connected evaporator loads are considered new installations. Importantly, these replacements are cumulative—meaning all prior repairs are counted toward the threshold when evaluating whether a system has effectively been replaced.

Ensuring Compliance

Understanding these repair restrictions is essential for businesses to ensure compliance and avoid potential penalties. As we move forward, staying informed and adapting to these regulations will be key to maintaining operational efficiency and environmental responsibility. This blog will help navigate the repair restrictions of refrigerated display cases.

Last month, we discussed the ways in which industrial and commercial refrigeration systems can achieve greater energy efficiency using modern components.

This month, we will delve into the advancements in commercial reach-in freezers and coolers, commonly known as refrigerated display cases within the industry. We will explore how these units have been optimized for efficiency and effective cooling with the integration of the latest refrigeration technology.

As energy costs rise, regulations evolve, and consumer demand for environmentally friendly solutions increases, evaluating your current commercial or industrial refrigeration system for a potential upgrade increases in importance. When considering an upgrade, several factors – such as the current condition of your equipment, maintenance costs, energy efficiency, and refrigerant type must be evaluated. Each of these factors play a role in determining the cost effectiveness of an upgrade.