Nine Reasons Cold Rooms Fail in the UAE — and What They All Have in Common

Almost every cold room we’re called out to has the same story attached. It worked beautifully when
it was new. It worked through the winter. Then somewhere around the first sustained 45°C week,
the compressor started running continuously, the temperature crept up, and someone started
throwing away product.

The instinct is to blame the equipment. In our experience that’s rarely where the fault started.
These nine problems account for the overwhelming majority of cold room failures in this
region, and eight of them are decided before anything is bought.

1. Condensing units rated for 35°C ambient

Most catalogue refrigeration equipment is rated at around 32–35°C ambient, because that’s a
sensible European or North American design condition. Dubai routinely exceeds 45°C, and the
air temperature immediately around a plant-room roof or a west-facing wall in July can be higher
still.

At those conditions a unit loses a substantial share of its rated capacity — precisely when you
need all of it. The system doesn’t break. It simply can’t do what the datasheet promised, in the
place you put it.

The fix is at selection stage: specify desert-rated equipment and size against
real local design conditions, including the microclimate of the specific position the unit will
occupy.

2. Heat load estimated instead of calculated

A proper heat load calculation accounts for:

• Panel transmission through walls, ceiling and floor
• Product load and the required pull-down rate
• Door openings per hour, and how long each one lasts
• Staff working in the room
• Lighting and any equipment inside
• Packaging entering with the product
• Forklifts and pallet trucks
• Infiltration through gaps and pressure differences

Skip that and you buy a system that copes when the room is half empty and struggles when it’s
full. The tell-tale sign is a room that holds temperature overnight but drifts during a working
shift.

3. Panel thickness chosen by price rather than duty

As a general guide, cool rooms want 60–80 mm, chillers 80–100 mm, and freezers
120–150 mm, with 150–200 mm for blast applications. Those aren’t arbitrary numbers.

Put chiller-grade panel on a freezer duty and you get permanent over-run, surface condensation on
the outside of the panel, and an energy bill nobody budgeted for. There is no clever control
strategy that recovers the physics.

4. The vapour barrier gets ignored

This is the one that costs the most and shows up the latest. In Gulf humidity, water vapour drives
relentlessly from the warm outside toward the cold inside. Where the vapour barrier is broken —
poor panel jointing, unsealed penetrations, a fixing driven straight through — moisture migrates
into the insulation core and condenses.

The insulation slowly waterlogs and loses its R-value. The panel eventually rots from the inside.
It’s invisible for two years and terminal in five, and by then the only remedy is replacing panel.

5. Condensers fouled by dust and sand

Gulf dust can clog condenser fins in weeks, not years. A blocked condenser can’t reject heat, so
head pressure rises, capacity drops, energy consumption spikes and compressor life shortens.

This is the single most common cause of “it’s not cooling like it used to.” It’s also the easiest
to prevent — but only if condenser position, guarding and a realistic cleaning interval are
designed in from the start rather than left to whoever holds the maintenance contract three years
later.

6. Doors, seals and air curtains treated as an afterthought

Every door opening pulls in warm, humid air. Without correct seals, door heater tape, strip
curtains or an air curtain, that moisture ends up as ice on the coil and water on the floor. You
get temperature swings, a slip hazard, and a defrost cycle that runs far more often than it should.

On a busy loading door, the cost of an air curtain is repaid quickly in avoided infiltration alone.

7. The wrong defrost strategy on freezers

Freezer coils ice up — that’s normal. What matters is whether the defrost method, frequency and
termination are matched to the room’s actual duty.

Get it wrong and the coil chokes, airflow collapses, the room warms, and the system fights itself
while the controller reports everything as normal. Hot-gas or electric defrost is an engineering
decision based on the room’s load profile, not a factory default to be left alone.

8. Freezer floors built without insulation or frost protection

A freezer sitting on an uninsulated slab pulls heat continuously from the ground beneath it.
Over time that causes frost heave, and the floor cracks.

Insulated floor panels, or an insulated screed with underfloor frost protection, solve it — but
only if they’re installed at the start. Retrofitting means emptying the room and taking up the
floor.

9. Electrical and control shortcuts

• Undersized cabling and no phase-failure protection shorten equipment life quietly.
• No high-temperature alarm and no data logging mean you find out about a failure when someone opens the door in the morning — after the stock is already lost.

For a facility holding high-value or regulated product, continuous logging with remote alerting
costs a fraction of a single spoiled load.

What they all have in common

Eight of these nine problems are decided before a single component is ordered — and every one of
them is buried by handover.

Panels, floors, drainage and refrigerant lines all disappear behind finished surfaces. That’s why
the heat load calculation and the design ambient are the cheapest engineering you will ever buy on
a cold room project, and the most expensive to get wrong.

Two questions worth asking any supplier

Before you accept a cold room quotation, ask for two things:

1. The heat load calculation. Not a summary — the actual calculation, showing what was included.
2. The design ambient temperature the equipment was selected against.

The answers tell you almost everything. A supplier who can produce both has engineered your room.
One who can’t has priced a box.

If your existing room is already struggling

Most of these faults are diagnosable in a single site visit. Condenser fouling, seal failure,
defrost problems and charge issues are all correctable without replacing the room. Panel and
insulation failures are more serious, but even then, knowing early is much cheaper than finding
out during an inspection.