Saudi factories are adapting in three main ways: they move heat-exposed work away from the 12:00 to 3:00 pm window, they strengthen and maintain their cooling plant (chillers, cooling towers and fan coil units), and they arrange backup or rental cooling so one equipment failure does not stop production. The same approach applies to Abu Dhabi factories, which face a similar climate and a similar seasonal work-hour framework.

The pressure is real. Saudi Arabia's National Center for Meteorology expected summer 2026 temperatures to be above normal in all regions, and it warned of 47°C to 49°C maximums across parts of the Eastern Province and the Riyadh Region in late July. Later heatwave warnings for the Eastern Province mentioned temperatures of up to 50°C, often combined with dust.

What are Saudi factories actually changing during extreme summer heat?

They are changing schedules, cooling capacity and contingency plans, in that order of speed. Schedules can be changed in days, cooling upgrades take weeks or months, and contingency arrangements sit in between.

• Work scheduling: Outdoor and loading-dock tasks are moved to early morning or evening so nothing happens under direct sun at midday.

• Cooling capacity: Plants check whether chillers, cooling towers and terminal units still deliver rated output when ambient temperature is at its peak.

• Heat-stress management: Employers follow Saudi guidance that calls for heat stress management plans and heat and humidity risk assessment matrices.

• Contingency cooling: Managers pre-agree how they will bring in temporary chillers or portable cooling if permanent plant fails.

Why does the midday work ban not solve the problem inside a factory?

The ban protects people working outdoors; it does not cool the inside of a production hall. Saudi Arabia's Ministry of Human Resources and Social Development bans work under direct sunlight between 12:00 pm and 3:00 pm from 15 June to 15 September for private-sector establishments. Enforcement is active: the ministry reported more than 17,000 field visits this summer and nearly 2,000 violations detected, and it reported 94% compliance in 2025.

Indoor lines, cold rooms, server rooms and process areas still need engineered cooling. A factory can be fully compliant with the ban and still lose product or output if its chilled water system cannot keep up. That gap is where most of the adaptation work now happens.

How do chillers keep production running when it is 45°C to 50°C outside?

A chiller removes heat from water that is then circulated to process equipment and air handling or fan coil units. At extreme ambient temperatures, the chiller has to reject heat into very hot air or water, so its capacity and efficiency can fall just when demand is highest. Factories therefore treat the chiller as critical infrastructure, not as a comfort utility.

Air-cooled vs water cooled chillers: which handles extreme heat better?

Neither is universally better. Air-cooled units are simpler to install and need no cooling tower, but their output typically drops as outside air gets hotter. Water cooled chillers are usually more energy-efficient at large scale, but they depend on cooling towers, water treatment and a reliable make-up water supply.

Dust is a practical issue as well. Heatwave warnings in the Eastern Province this summer repeatedly came with dust, and dust-clogged condenser coils reduce heat rejection. Pre-summer coil cleaning is a low-cost, high-value step.

What role do fan coil units play in factory cooling?

A fan coil unit (FCU) is the terminal device that delivers chilled water cooling into a space. Chilled water from the chiller runs through a coil, and a fan blows air across it into offices, control rooms, packing halls or labs. If the chiller fails or loses capacity, every fan coil unit on that loop warms up with it.

For this reason, factories treat FCUs and air handling units as part of one system with the chiller. Checking filters, condensate drains, valves and fan motors before summer prevents small faults from looking like "chiller problems".

What happens when a chiller goes down in peak summer?

When a chiller goes down, the chilled water loop warms up quickly, and process temperatures, product quality and worker comfort deteriorate within hours rather than days. The right response is to isolate the fault, protect critical loads, and bring in temporary capacity while the permanent unit is repaired.

A practical response sequence:

1. Confirm the failure and identify which loads are affected (process, cold storage, offices).

2. Prioritise critical loads, such as product-sensitive areas, over comfort areas.

3. Reduce heat load where possible: shut non-essential equipment and close doors to cold areas.

4. Estimate the repair time. If it is longer than the tolerance of the process, arrange temporary cooling.

5. Specify the temporary unit: capacity in kW or TR, chilled water temperatures, power supply and connection points.

6. Commission the temporary chiller and confirm flow, temperatures and controls before relying on it.

The key decision is step 4. Many plants lose more time deciding than the repair itself takes, which is why pre-agreed rental arrangements matter.

When does chiller rental make sense for a factory?

Chiller rental makes sense whenever a cooling need is temporary, urgent or too costly to cover with owned equipment. It converts a large capital purchase into an operating cost for as long as the need lasts.

Rental still needs engineering. Capacity, power availability, piping connections, water quality and site access should be checked with the supplier before deployment. Providers such as Trane Rental MEA offer temporary cooling with engineering support, installation, commissioning and 24/7 emergency response across the region, which shortens that checking step.

What should Abu Dhabi facility managers take from the Saudi experience?

They should assume that the hottest weeks will test the weakest part of the cooling system, and prepare before it happens. Abu Dhabi factories operate under a comparable summer pattern, including a seasonal midday break for outdoor work, so the same planning logic applies.

Pre-summer checklist

• Test chiller performance at high load and record leaving and entering water temperatures.

• Clean condenser coils and inspect cooling towers, fill and water treatment.

• Service fan coil units and air handling units: filters, drains, valves, fans.

• Identify critical loads and the minimum cooling they need.

• Confirm spare parts availability for compressors, pumps and controls.

• Define temporary power and piping connection points for a rental chiller.

• Agree a call-out contact for emergency cooling before it is needed.

Is it better to upgrade permanent cooling or add backup capacity?

Usually both, in sequence. Maintenance and small efficiency fixes are the fastest return. Backup capacity, through rental or a standby unit, protects against failure. Permanent upgrades make sense when load has grown or equipment is near end of life, and they take longer to plan and approve.

Conclusion: Saudi factories are showing that heat resilience is a system decision, not a single purchase. Reschedule outdoor work, keep chillers, towers and fan coil units in condition, and decide in advance how temporary cooling will be brought in. If your Abu Dhabi facility needs backup or temporary chiller capacity, a pre-summer site assessment with an engineering-led rental provider is the practical first step.

Call to action: Speak to the Trane Rental MEA team about temporary chillers and emergency cooling for your site.

4. FAQ Section

Does the Saudi midday work ban apply to indoor factory work? No. It applies to work under direct sunlight, so it targets outdoor tasks. Indoor areas are covered by general occupational safety and heat stress management duties.

When does the Saudi midday work ban start and end? It runs from 15 June to 15 September, from 12:00 pm to 3:00 pm, for private-sector establishments, according to the Ministry of Human Resources and Social Development.

What is a fan coil unit? It is a terminal unit with a chilled water coil and fan that cools the air in a room or zone. It depends on a chiller for its cooling supply.

What does "chiller down" mean? It is industry shorthand for a chiller that has stopped or tripped through a fault, so chilled water is no longer being cooled.

Do water cooled chillers need a cooling tower? Generally yes. The tower rejects the heat carried by the condenser water to the atmosphere, so tower condition directly affects chiller performance.

How quickly can a temporary chiller be installed? It depends on capacity, site connections, power and availability. Ask the supplier for a site-specific estimate rather than relying on a general number.

Can rental chillers support cold storage or process cooling? Yes, if the unit is specified for the required temperature and capacity. Confirm leaving water temperature, glycol requirements and controls before ordering.