Import & Export Guides
Cold Storage for Dark Stores and Quick-Commerce Hubs in Dhaka
Sep
Quick-commerce grocery delivery has changed what a “small cold room” needs to do in Dhaka. A traditional grocery shop opens its fridge a few dozen times an hour when it is busy. A dark store — a small neighbourhood warehouse that serves online orders only, with no walk-in customers — may have pickers opening chilled and frozen storage constantly, all day, while trying to hand orders to riders within minutes. Cold storage designed for a shop often struggles in that setting.
This guide looks at the cold storage decisions specific to dark stores and quick-commerce hubs: what to keep where, how to choose between display fridges and a mini cold room, how to handle constant door opening, and how to protect the cold chain in the short but critical minutes between the shelf and the rider’s bag.
What a dark store actually needs to keep cold
A typical quick-commerce assortment has at least three temperature groups, and some operators add a fourth:
| Group | Typical products | Main risk if handled wrongly |
|---|---|---|
| Chilled dairy and ready foods | Milk, yogurt, cheese, butter, eggs in some formats, ready-to-eat items | Shortened shelf life, spoilage complaints |
| Frozen | Ice cream, frozen snacks, frozen fish and meat, frozen paratha | Partial thawing and refreezing, texture damage, food safety risk |
| Fresh produce | Leafy greens, herbs, some fruit | Wilting and moisture loss; some items are damaged by too much cold |
| Fresh meat and fish (if sold) | Chilled chicken, beef, fish | Rapid bacterial growth if temperature control slips |
The last two rows are the ones operators most often underestimate. Produce does not all want the same conditions — some items suffer chilling injury if kept too cold, which is covered in our guide on chilling injury. The right setpoints for each group depend on the products and the manufacturers’ storage instructions; we set them per project rather than quoting a universal figure.
Display fridges, a mini cold room, or both
Most small dark stores start with reach-in fridges and chest freezers because they are quick to buy. As order volume grows, operators run into limits: too many separate units to monitor, inconsistent temperatures, and floor space eaten by appliances. A walk-in mini cold room is the usual next step, but it is not automatically better.
| Factor | Reach-in fridges and chest freezers | Walk-in mini cold room |
|---|---|---|
| Upfront effort | Buy and plug in | Needs design, installation and a suitable space |
| Temperature stability under heavy door use | Each opening exposes the whole unit | Larger thermal mass; stability depends on door design |
| Picking speed | Fast for a small number of items | Fast if shelving and layout are planned for picking |
| Monitoring | Many units, many failure points | One or two systems to monitor |
| Flexibility | Easy to add or move units | Fixed once built; harder to relocate |
Many operators end up with a hybrid: a walk-in chiller for bulk dairy and produce, with a smaller number of freezers for ice cream and frozen lines. The right mix depends on your order profile and your building, which is why our guide on sizing a mini cold storage starts with your actual daily throughput rather than a standard size.
The door problem: designing for constant opening
Every time a cold room door opens, warm humid air flows in and cold air spills out at floor level. The refrigeration system then has to remove not only the heat but the moisture, which freezes onto the evaporator coil and must later be defrosted. In a dark store with pickers going in and out all day, this infiltration load can be larger than the heat coming through the walls.
Practical measures reduce it considerably:
- Strip curtains or a fast-closing door so the doorway is not left open while a picker searches for an item.
- A picking layout that puts fast-moving items nearest the door, so most picks take seconds.
- Batch picking — collecting chilled items for several orders in one trip instead of one trip per order.
- A small ante-area or buffer in buildings where the cold room door opens directly onto a hot corridor.
- Refrigeration sized for the real door pattern, not for a shop. Tell the designer how many picks per hour you expect at peak.
Frequent door opening also affects defrost. If the coil ices up faster than the defrost cycle clears it, airflow drops and temperatures creep up during the busiest hours — exactly when you can least afford it. Our guide on defrost cycles explains the options.
Fitting cold storage into a rented Dhaka building
Dark stores are usually in rented ground floors, basements or first floors of mixed-use buildings, chosen for location rather than for cold storage. That creates specific constraints:
- Condenser placement. The condensing unit needs somewhere to reject heat — a rooftop, a balcony, or an outside wall with airflow. A condenser placed in a closed shaft or next to a generator exhaust will run inefficiently and fail early. See our guide on condenser placement.
- Landlord permission. Panels, refrigerant piping and wall penetrations need the owner’s agreement. Put it in writing before installation.
- Floor and height. Panel rooms need a level floor and enough ceiling height for the room plus the evaporator. Basements may have drainage and humidity issues.
- Relocation. Quick-commerce operators often move sites as they learn their demand. Modular panel rooms can be dismantled and reinstalled, which is worth considering at the start.
Power cuts and backup
A dark store cannot pause its cold chain during load-shedding. A well-insulated walk-in room with the door kept shut holds temperature longer than a set of reach-in fridges being opened constantly, but no room holds indefinitely while pickers keep working. Plan backup power for the refrigeration load, and decide in advance what happens operationally during a long outage — for example, temporarily hiding frozen lines from the app. Our guide to backup power for mini cold storage covers generator and IPS options.
The last minutes: from shelf to rider
In quick commerce, the most fragile part of the cold chain is often the shortest: the few minutes between picking and the rider leaving, and then the ride itself through traffic. Good practice includes picking chilled and frozen items last, packing them together in an insulated bag with appropriate cold packs, and not leaving packed orders waiting on a warm counter because a rider is late. Our guide on last-mile cold chain in Dhaka traffic goes into this in depth.
Stock rotation matters too. Fast-moving dairy needs strict first-expiry-first-out picking; see FIFO vs FEFO. And keep a simple temperature log, even if you have digital monitoring — it gives staff a reason to look at the display several times a day.
Cleaning a cold room that never closes
A shop can clean its fridges after closing time. Many dark stores operate from early morning to late at night, and some around the clock, so there is no natural moment when the cold room is empty. Cleaning then gets postponed, and spills from yogurt tubs, leaking meat packs or thawed ice cream build up on shelves and floors. In a chilled room these residues support mould and odours; in a freezer, spilled liquid freezes into ice that makes floors slippery and hides damage.
The fix is a planned schedule rather than a heroic deep clean: wipe spills as they happen, clean one shelf section per shift on a rotation, and plan a fuller clean during the quietest hour of the week, moving stock temporarily to a backup unit or insulated boxes. Keep raw meat and fish on the lowest shelves and in trays so drips cannot reach ready-to-eat products. Our guide on cleaning and sanitising a mini cold storage covers products and methods that are safe for panels and evaporators.
Common mistakes
- Buying shop equipment for warehouse use. Display fridges designed for occasional customer access can struggle with constant picking.
- Mixing produce and frozen goods in one space. Neither gets the conditions it needs.
- Ignoring the condenser location. The unit overheats in summer, just as demand peaks.
- No plan for outages. Staff keep picking from a room that is warming, spreading the damage across many orders.
Equipment choice and cost depend on your order volume, product mix and building. Ask us for a proposal built around your site and your peak-hour picking pattern.
Talk to DE International
DE International supplies mini cold storage rooms from China and handles freight, clearance and installation coordination in Bangladesh. See our services, the China sourcing and buying agent service, products in our shop, or contact us for a site review.
