Why Strip Curtains Could Be Costing Your Cold Store Thousands.

If your cold store still relies on PVC strip curtains, there’s a good chance they’re quietly driving up your cold storage energy costs every single day — not through one dramatic failure, but through hundreds of small ones. A gap here. A torn strip there. A forklift that’s cut a section away for “better visibility.” None of it looks like a problem on the shop floor. On your energy bill, it adds up fast.

For facility managers, engineers, and operations directors running cold stores, freezer rooms, or blast chill environments, doorway protection isn’t a minor spec line, it’s one of the biggest controllable variables in your refrigeration running costs. This article breaks down exactly how strip curtains lose you money, what it means for hygiene compliance, and how strip curtains vs air curtains actually compares when you look at total cost of ownership rather than sticker price.

How Much Energy Do Cold Store Doors Really Lose?

Doorways are the single biggest source of unplanned heat gain in most cold storage facilities. Every time a door opens, warm, humid air rushes in at the top of the opening while cold, dry air sinks out at the bottom — a process known as convection or “air flooding.” Industry design guidance puts convection losses at up to 85% of the total energy loss associated with door openings, making it by far the largest controllable factor in refrigeration load.

Refrigeration itself typically accounts for 30–40% or more of total operating costs in a cold storage facility, so even modest reductions in door-related heat gain translate directly into bottom-line savings. Facilities relying on outdated or poorly maintained doorway barriers commonly spend 20–30% more on energy annually than sites using modern, well-specified alternatives.

A strip curtain, in theory, exists to stop exactly this. In practice, its performance degrades the moment it’s installed.

Why Do Strip Curtains Lose Effectiveness So Quickly?

Strip curtains work on a simple principle: overlapping PVC strips form a physical seal that goods and people push through. When new, a well-fitted strip curtain does a reasonable job of separating temperature zones. The problem is what happens next.

In real-world cold storage operations, strip curtains routinely suffer from:

• Physical damage — forklift traffic warps, tears, and eventually shreds the strips, especially at the base
• Deliberate modification — strips get tied back, cut short, or removed altogether by staff trying to improve visibility or speed up throughput
• Loss of overlap — as strips age and stiffen, the seal between them opens up, allowing continuous air exchange even when “closed”
• Repair costs — collision damage from reduced visibility can run into the thousands each time a door or curtain assembly needs replacing

Once a strip curtain is damaged or propped open, it stops functioning as a barrier at all, but it keeps looking like one, which is often the most expensive part of the problem. Nobody notices the leak because there’s still a curtain hanging in the doorway.

What’s the Hygiene Risk of PVC Strip Curtains in Cold Storage?

Beyond energy, strip curtains carry an often-overlooked food safety risk. Because strips make direct physical contact with every pallet, trolley, and forklift that passes through, they act as a contact surface for whatever is on those surfaces – grease, product residue, and moisture. Guidance on cold room hygiene notes that PVC strips can collect dust, grease, and food spillages, requiring a dedicated cleaning schedule to remain hygienic — a schedule that, anecdotally, is one of the first things to slip under operational pressure.

The moisture dimension matters too. Damp, chilled conditions are exactly where pathogens like Listeria monocytogenes thrive, and condensation is a direct consequence of warm, humid air infiltrating a cold environment — precisely what a failing strip curtain allows. For anyone running a HACCP-audited site, a visibly degraded, grease-marked strip curtain sitting between clean and dirty zones is a difficult thing to defend during an audit – Thermoscreens has covered this specific risk in the context of chilled food environments, including a recent trial with DO & CO in a high-risk chiller environment.

None of this means every strip curtain installation is unsafe. Food-grade PVC exists precisely to meet contact-material regulations. But it does mean strip curtains introduce a hygiene management burden that a non-contact barrier simply doesn’t have.

How Does an Air Curtain Work as an Alternative?

An air curtain creates an invisible barrier of high-velocity, temperature-matched air across a doorway. Rather than relying on a physical strip that people and vehicles must push through, the air stream itself resists the exchange of warm and cold air, letting forklifts, pallets, and staff move through completely unobstructed.

Thermoscreens’ Cold Store (CS) range, for example, is engineered specifically for this job: positioned inside the cold store, it recirculates ambient air through energy-efficient EC fans to form a consistent thermal barrier, down to temperatures as low as -25°C. Because there’s no physical contact between goods and the barrier, there’s no strip to tear, warp, or contaminate — and no cleaning schedule for the barrier itself.

Independent research on doorway air control, including studies referenced by ASHRAE and the Carbon Trust, indicates that correctly specified air curtains can reduce cold air infiltration by 60–80% compared with an open, unprotected doorway. Industry guidance from the Institute of Refrigeration and FETA similarly points to energy loss reductions of over 65% in facilities where cold store doors are open for more than 1,000 hours a year.

Air curtains also address the two operational headaches strip curtains create: forklift downtime from pushing through strips, and ice and frost build-up caused by moisture infiltration. Thermoscreens has previously written in detail about how ice and frost form in cold stores and how to reduce it — a problem strip curtains actively contribute to rather than solve.

What’s the ROI of Switching from Strip Curtains to an Air Curtain?

This is the question that actually matters to anyone signing off the capital spend. Air curtains cost more upfront than strip curtains — that’s not in dispute. What changes the calculation is total cost of ownership over the life of the installation.

Strip curtains have a lower purchase price but accumulate ongoing costs: strip replacement from wear and forklift damage, cleaning labour, and the energy loss of a barrier that’s rarely performing at spec once it’s been in use for a few months. Air curtains have a higher installation cost but a materially lower run-rate: no consumable strips to replace, no barrier-specific cleaning regime, and consistent – rather than degrading, thermal performance over time.

With UK electricity costs remaining high, the energy-saving side of that equation compounds quickly, and older or already-strained refrigeration systems tend to see the largest relative benefit from reduced door-opening load. Thermoscreens has published real operational data on this exact question — see Do Air Curtains Actually Pay for Themselves? Real ROI Data Explained for site-level figures on payback periods and defrost-cycle reduction.

Strip Curtains vs Air Curtains: A Side-by-Side Comparison