How the K750 Energy Door Helps Supermarkets Achieve Energy Efficiency Targets

Cold rooms and walk-in fridges are among the most energy-intensive parts of any supermarket operation, which is why having a K750 Energy door is essential to achieve your energy efficiency targets. The refrigeration plant runs constantly, and every time a door opens at a busy access point, warm air floods in and the system has to work harder to compensate. Do that hundreds of times a day, across every cold room in a store, and the cumulative energy cost is significant.

Door specification is one of the most direct levers available to facilities managers trying to bring those costs down. And for supermarkets specifically, the K750 Energy Door has become the cold room door of choice across the UK and Europe. Here's why.

What Is the K750 Energy Door?

The K750 is Kenfield's patented, award-winning energy saving door, designed specifically for walk-in cold rooms and temperature-controlled access points. It's a flip-flap cold room door: flexible, self-returning panels that allow staff to pass through quickly in either direction, without having to stop and manually open or close a door.

With over 35,000 installations across UK, European and American supermarkets, it has a proven track record in exactly the environments where energy efficiency is under the most scrutiny. Major retailers including Tesco, Sainsbury's, Asda, Aldi, Morrisons and Iceland have the K750 fitted in their cold room operations.

The Energy Problem the K750 Solves

To understand why the K750 makes a difference, it helps to understand where the energy loss actually comes from in a busy cold room environment.

Every time a walk-in cold room door opens, two things happen simultaneously. Cold air spills out at floor level, and warm ambient air enters at the top of the opening. Even a door that's open for only a few seconds allows a significant exchange of air. In a high-traffic back-of-house environment, where staff are moving in and out of a cold room continuously throughout a shift, those seconds add up fast.

Traditional door solutions often compound the problem rather than solving it. Heavy-duty cold room doors that require manual operation get propped open or left ajar during busy periods because closing them slows the workflow down. When that happens, the cold room is essentially open to the ambient environment for extended periods, and the refrigeration plant has to run continuously at full load to compensate.

The K750 addresses this directly. The K750 can offer up to 50% energy usage reduction compared to using an unhooked (or in poor condition) PVC strip curtain. Its flexible, lightweight panels allow staff to walk through without breaking stride. The door opens with body contact and returns to the sealed position immediately after. There is no handle, no need to stop and pull, no temptation to prop it open. The access point stays effectively closed between uses, even during the busiest periods of a shift.

Key Features and How They Contribute to Energy Performance

Flexible panel construction from heavy-duty PVC or polyurethane

The panel material is central to the door's performance. Heavy-duty PVC and polyurethane both provide good insulation and structural resilience. The flexibility of the panels is what enables the self-returning action, and the abrasion-resistant skin maintains that performance over a long service life, even under constant daily use.

No external frame

The absence of an external frame simplifies installation and reduces the number of components that can degrade or fail over time. It also makes the door easier to fit into existing cold room openings without modifications to the surrounding structure.

Lightweight and staff-friendly design

A door that staff find awkward to use gets propped open or avoided. The K750 is designed to be as close to frictionless as possible for the people using it every day. Lightweight construction means minimal resistance on contact, and the self-returning action requires no effort at all on exit.

No finger trap

Safety in busy cold room environments matters, and the K750 is designed with a no-finger-trap configuration. That's a practical consideration for any high-traffic area where staff are moving quickly with hands full of stock.

Hinge guard

The hinge area is protected, which extends the working life of the door and reduces the maintenance requirement over time. Less maintenance means fewer periods of reduced door performance, which in turn means more consistent energy efficiency.

Available in single and double configurations

Cold room openings vary considerably across different supermarket formats and layouts. The K750 is available in configurations to suit those different requirements, ensuring a proper fit rather than a compromise.

Easy installation using the optional bracket

Fitting the K750 into an existing cold room access point is straightforward, which reduces installation time and disruption to operations.

Why Door Specification Matters for Supermarket Energy Targets

UK supermarkets operate under significant and increasing pressure to reduce energy consumption and cut carbon emissions. Regulatory requirements, sustainability commitments, and the direct cost of energy all push in the same direction. Facilities teams are expected to find savings across the estate, and the cold chain is always one of the first areas of focus because of how energy-intensive it is.

The cold room door is a relatively modest capital investment compared with refrigeration plant, LED lighting upgrades, or building fabric improvements, but its impact on energy use is disproportionately large. A well-specified energy saving door at a high-traffic access point reduces warm air ingress throughout every hour of operation, every day, every year. That's a continuous saving, not a one-time gain.

The K750 also reduces ice build-up, which is an indirect energy saving. Ice accumulation on evaporator coils forces the refrigeration system to work harder and requires defrost cycles that consume additional energy. By reducing warm, moist air ingress, the K750 reduces the conditions that cause ice to form in the first place.

It's worth being clear about one thing: the K750 works best as part of a well-maintained cold room system. If a cold room has pre-existing refrigeration faults or underlying icing problems, a new door will not fix those issues on its own. The door addresses the access point. The refrigeration plant, insulation and layout need to be in good order for the overall system to perform at its best.

Where the K750 Is Used

The K750 is specified for walk-in cold rooms and freezer rooms across a wide range of supermarket and food retail environments. Common applications include:

• Back-of-house cold room access in supermarkets and convenience stores

• Walk-in fridge and freezer rooms in food retail operations

• Cold storage areas in food production and distribution facilities

• Refrigerated back-of-house areas in hospitality and catering operations

• Cold chain logistics and distribution centres

It's particularly well-suited to high-traffic access points where doors are opened frequently during a shift. The energy benefit is greatest in those environments precisely because there are more opportunities for warm air ingress to occur.

Proven in the UK's Most Demanding Retail Environments

The K750's installation base across UK, European and American supermarkets is the strongest evidence available for its performance. These are organisations with substantial facilities management teams, rigorous procurement processes, and the operational data to evaluate whether a product delivers against its claimed benefits.

The fact that the K750 continues to be specified by major retailers tells you something that no product brochure can: it works, at scale, in real operating conditions.

We've been manufacturing specialist cold room door solutions from our Birmingham facility since 1983. Over 40 years of working in food retail and cold chain environments means we know what facilities managers actually need from a cold room door, and we've built the K750 around those requirements.

If you'd like to discuss specifying the K750 Energy Door for your supermarket or cold storage facility, our team is here to help. Call us on +44 (0)121 451 3051, visit kenfield.com/k750-energy.html, or use our contact form at kenfield.com and we'll get back to you.

We've been a trusted partner to UK food retail and cold chain operations since 1983. Get in touch and we'll help you find the right configuration for your facility.