IoT Audit: Improve Data Reliability and Enhance Building Energy Performance

Connected devices (IoT) now form the backbone of smart buildings. Temperature sensors, energy meters, occupancy detectors, controllers, and connected lighting systems generate vast amounts of data every day to help optimise energy consumption and occupant comfort.

Yet data only creates value when it is reliable, consistent, and actionable. That is the purpose of an IoT audit: not a cybersecurity assessment, but a performance and reliability review of connected systems to support better energy management.


At Eficia, the IoT audit is part of a broader approach designed to understand, secure, and optimise building energy performance around the clock through data.

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Why auditing your IoT systems has become essential

A surge in sensors across commercial buildings

As energy performance requirements become more widespread across commercial real estate, buildings have been equipped with an ever-growing number of connected devices.

Each site can now include hundreds of connected points: temperature sensors, CO₂ probes, sub-meters, gateways, control modules, and more.


The result is a massive volume of data, whose reliability directly determines building energy performance.

 

The risk of invisible drift

Over time, sensors lose calibration, connections deteriorate, and some data stops being transmitted altogether. Without regular audits, these hidden drifts distort analysis and create control errors that can lead to 10% to 15% additional energy consumption.

 

An IoT audit helps detect these anomalies before they impact the overall performance of the building.

 

What is an IoT audit focused on energy performance?

An IoT audit assesses the quality, consistency, and continuity of data generated by connected building systems.

Unlike a cybersecurity audit, its purpose is not to identify security vulnerabilities, but performance failures: poorly placed sensors, misconfigured protocols, inconsistent values, or data that is not properly used by the Building Management System (BMS).

It is based on four main pillars:

  • Inventory of connected equipment: sensors, gateways, controllers, and communication buses such as BACnet, Modbus, LoRa, and Zigbee
  • Data quality control: measurement consistency, statistical noise, loss rates, and duplicate data
  • BMS / IoT compatibility review: correct integration of signals into energy management algorithms
  • Supervision and resilience assessment: service continuity, redundancy, and secure protocols such as HTTPS and MQTTs

In short, an IoT audit is designed to guarantee the reliability of the system that feeds your energy decisions.

 

The concrete benefits for your connected buildings

Improve the reliability of your energy data

High-performance energy management starts with accurate data. An IoT audit identifies faulty sensors, duplicates, and measurement gaps to restore a reliable data foundation, essential for tracking energy savings and meeting regulatory requirements.

 

Optimise energy performance

A well-calibrated IoT system allows the BMS or Eficia’s energy management platform to operate with greater precision: adjusted setpoints, optimised schedules, and automatic detection of operational drift.

On average, an IoT audit and recalibration programme can generate up to 15% additional energy performance gains for a building.

 

Ensure regulatory compliance

BACS and tertiary energy efficiency regulations require reliable monitoring, control, and measurement systems. An IoT audit helps verify the compliance of sensors, gateways, and communication protocols in line with ISO 52120-1, formerly EN 15232, the reference standard for the energy performance of building automation and control systems.

 

Strengthen security and service continuity

While cybersecurity is not the core purpose of the audit, an IoT review also includes checks on access management, certificates, OTA updates, and network segmentation.

This functional security approach helps ensure resilient energy management, even in the event of a failure or connectivity loss.

 

How does an IoT audit with Eficia work?

1. Mapping the connected asset base

A complete inventory is carried out for all deployed sensors, controllers, meters, and gateways across each site.

The goal is to obtain a clear view of the entire measurement and control chain.

 

2. Verifying connectivity and data consistency

Real-time flows are analysed to assess signal quality, data synchronisation, and cross-sensor consistency, for example comparing indoor temperature readings with HVAC setpoints.

 

3. Assessing energy performance

IoT data is cross-checked against actual energy consumption to identify deviations and savings opportunities.

Unused or underutilised sensors are also detected.

 

4. Delivering operational recommendations

A detailed report outlines the actions to be implemented: recalibration, maintenance, replacement, or software upgrades.

Each recommendation is quantified and prioritised according to expected energy return on investment.

 

5. Integration and continuous monitoring

The audit findings are integrated into the Eficia supervision platform, enabling follow-up of corrective actions and ongoing verification of performance gains over time.

 

IoT audit and BMS: a powerful combination for energy efficiency

A Building Management System (BMS) uses IoT data to control heating, ventilation, lighting, and air conditioning.

But when sensors are inaccurate, the entire control strategy loses relevance.

An IoT audit acts as a quality control layer for the BMS. It verifies that each measured data point is accurate, actionable, and transmitted at the right time.

This approach helps guarantee:

  • long-term energy savings
  • operations aligned with BACS requirements
  • and a truly smart building, able to continuously adapt to real usage conditions

A sovereign, reliable, and sustainable IoT approach

Eficia has chosen a sovereign IoT model, hosted and supervised in Europe, and aligned with recognised security standards such as ETSI EN 303 645 and ISO 27001.

Our IoT experts and Energy Managers work together every day to maintain the reliability of our clients’ connected infrastructure through:

  • regular audits and recalibration
  • predictive maintenance
  • secure Over-The-Air (OTA) updates
  • 24/7 supervision from our Energy Center

This approach ensures full control over energy data: precise, traceable, and actionable to support carbon reduction targets.

 

IoT audit: a strategic and profitable investment

An IoT audit is not a cost. It is a performance and compliance lever.

  • By identifying technical drift before it turns into energy waste, it helps to:
  • secure results under tertiary energy efficiency regulations
  • improve the quality of building energy management
  • and enhance real estate asset value within an ESG strategy

 

At Eficia, we see IoT auditing as a continuous improvement tool that supports high-performance, connected, and responsible building operations.