2026-07-29 · TWH AI

Case Study: Improving AC and Electrical Maintenance SLA for Multi-Site Warehouses in Thailand

See how a warehouse operator improved AC and electrical maintenance SLA, reduced downtime, and standardized vendor execution across multiple Thai sites.

For foreign manufacturers, 3PL operators, and regional property teams running warehouses in Thailand, maintenance performance often looks acceptable on paper until the first major disruption hits. Air-conditioning fails in a temperature-sensitive storage zone, a breaker trips during peak loading, or a local contractor closes a job without proper reporting in English. The result is familiar: inconsistent service levels, unclear root causes, and too much dependence on individual site staff. This case study shows how one multi-site warehouse operator in Thailand improved its AC and electrical maintenance SLA, reduced downtime, and created a more transparent vendor-management process aligned with international expectations.

The client situation: multi-site growth, inconsistent maintenance outcomes

The client in this case was a regional warehouse operator managing five facilities in Thailand: two in Bangkok, one in Samut Prakan, one in Chonburi, and one in Ayutthaya. The portfolio included ambient warehouses, loading and dispatch areas, office mezzanines, battery-charging zones, and small temperature-controlled rooms for selected products.

From a leasing and operations perspective, the sites were performing well. Occupancy was strong, and throughput was increasing. But facility maintenance was becoming a serious management issue, especially in two technical areas:

The company had been using different local vendors at each site. That setup initially seemed practical because each site team could call a nearby contractor. In reality, it created five separate maintenance standards.

The key problems identified

A review of service records over a 12-month period found several recurring issues:

For the expatriate property director, the biggest issue was not only downtime. It was lack of transparency. When senior management asked, “What is our maintenance performance in Thailand?” there was no clean answer.

Why SLA performance mattered in warehouse operations

In warehouse environments, some stakeholders underestimate the importance of AC and electrical maintenance because the buildings are not always fully air-conditioned like offices or hotels. But in practice, these systems directly affect uptime, safety, employee comfort, compliance, and tenant satisfaction.

AC impact in warehouse settings

Even in non-cold-chain facilities, air-conditioning often supports:

A failed 60,000 BTU split-type unit in a warehouse office may not stop the whole site, but it can disrupt planning operations, create staff complaints, and affect electronics reliability. In Thailand’s hot and humid climate, delayed AC repair quickly becomes an operational issue.

Typical Thai market pricing for warehouse-related AC maintenance in 2025 may include:

These numbers vary by brand, access difficulty, and province, but they show why reactive-only maintenance becomes expensive.

For companies looking to standardize technical scope, service frequency, and reporting, a structured air-conditioning maintenance service model is usually more effective than one-off callouts.

Electrical impact in warehouse settings

Electrical faults create even bigger risk. In these sites, electrical maintenance covered:

Typical electrical issues recorded by the client included nuisance breaker trips, overheating terminations, failed lighting circuits in loading areas, and undocumented temporary repairs.

Representative Thai market prices for common electrical maintenance items:

For multi-site operators, the challenge is not just cost. It is ensuring work is done safely, consistently, and with proper records. That is why many landlords and operators move toward a more formal electrical maintenance service framework rather than ad hoc local procurement.

Baseline assessment: what the operator measured first

Before changing vendors or SLAs, the operator completed a 6-week baseline assessment. This step was important because many maintenance improvement programs fail when teams jump directly to tendering without defining the real problems.

Asset mapping

The first task was to build a practical asset register across all five warehouses. The team documented:

For each major asset, they recorded:

This immediately exposed one major gap: almost 30% of the AC units had no consistent maintenance history, and 20% of electrical panels had no recent tightening or thermal inspection record.

Failure data review

The team then reviewed 12 months of reactive work orders. Across the five sites, they identified:

Not every incident stopped warehouse dispatch. However, the cumulative impact was significant. Repeated small failures were creating avoidable operational friction.

Commercial review

The operator also compared invoice data for similar works. The pricing spread was wider than expected:

Some cost variation was justified due to distance or brand differences, but not all. There was no standardized rate card, no approved parts matrix, and no benchmark for emergency versus normal callout pricing.

The new SLA framework: what changed

After the assessment, the company appointed a single managed maintenance partner with multi-site coverage capability in Thailand. The objective was not simply to consolidate vendors. It was to create one service language across all sites.

A broader property maintenance program was established, with AC and electrical workstreams defined under separate scopes but governed by the same reporting and escalation rules.

SLA tiers

The company introduced four incident priority levels:

Priority 1: Critical operational or safety issue

Examples:

Target:

Priority 2: Significant degradation

Examples:

Target:

Priority 3: Non-critical corrective maintenance

Examples:

Target:

Priority 4: Planned work or improvement item

Examples:

Target:

This was a major improvement over the previous system, where every issue was simply “urgent” to the site team but not clearly prioritized at portfolio level.

Standardizing preventive maintenance

Reactive control alone was not enough. The operator also standardized preventive maintenance frequencies and checklists.

AC preventive maintenance scope

For standard office and support-area units, the agreed preventive maintenance frequency was quarterly. The checklist included:

For higher-use spaces, such as operations rooms with long daily run hours, monthly visual checks were added.

Electrical preventive maintenance scope

Electrical preventive maintenance was divided into monthly visual review, quarterly inspection, and annual detailed review.

Quarterly scope included:

Annual scope included a more detailed planned shutdown review at selected sites.

This schedule reflected local operating realities in Thailand: heat, humidity, dust ingress, high AC runtime, and continuous warehouse use. It also aligned better with international facility-management expectations for auditability.

Reporting in clear English: a small change with major impact

One of the most appreciated improvements was the reporting format. Previously, many job updates were sent informally via Thai-language chat, with limited technical detail. Local teams could understand them, but regional management could not.

The new process required every job to have:

Example of old vs new reporting

Old note: “Air con fixed. เติมน้ำยาแล้ว ใช้ได้”

New report: “Unit AC-BKK2-OPS-03 was found operating with low cooling output. Technician identified low refrigerant pressure and oil staining at flare connection, indicating probable gas leak. Temporary refrigerant top-up performed to restore cooling. Permanent repair recommendation: isolate system, repair leak point, pressure test, vacuum, and recharge. Unit restored to 21°C discharge performance at time of attendance.”

This level of clarity helped the foreign facility manager make faster decisions and reduced the need for repeated clarification.

Execution model across Bangkok and upcountry sites

A common concern in Thailand is whether one vendor can truly deliver the same quality in Bangkok, the Eastern Seaboard, and central provinces. The answer depends on the operating model.

In this case, the vendor used a hub-and-spoke approach:

What was kept centralized

The operator intentionally centralized:

What stayed local

At site level, the process still allowed flexibility for:

This balance worked well. It avoided over-centralization while still eliminating the old “every site does it differently” pattern.

Results after 9 months

After nine months under the new maintenance model, the operator reviewed performance across the same five sites.

SLA improvement

Measured results included:

Downtime reduction

Estimated affected operational/support-area downtime dropped from 214 hours annually projected baseline to 121 hours on a comparable run-rate basis, a reduction of around 43%.

The biggest gains came from:

Cost outcome

Interestingly, total maintenance spending did not fall dramatically in the first two quarters. In fact, it rose slightly by around 8% because the operator approved backlog corrective works that had previously

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