How IoT is transforming HVAC from cost centre to strategic asset

1 January 2026

The Internet of Things (IoT) is enabling businesses to cut waste, prevent failures and unlock financial and environmental gains. Lee Harpham argues that IoT can help to transform HVAC systems from an expensive necessity into a smart, efficiency-driven asset.

Heating, Ventilation, and Air Conditioning (HVAC) systems for most commercial organisations today are non-negotiable for both occupant comfort and safety, but they come at a huge financial and environmental cost. The International Energy Agency (IEA) reports that space cooling alone accounts for nearly 20% of total electricity used in buildings globally, and this demand is growing rapidly due to climate change and increased adoption in developing countries.

As businesses grapple with soaring utility bills and intensified climate responsibilities, a technological evolution is providing a powerful solution. The integration of IoT is fundamentally revolutionising HVAC management, transforming it from a reactive cost centre into a proactive, strategic asset that delivers sustainability and cost-efficiency.

The convergence of IoT and HVAC marks a shift from traditional, calendar-based operation and maintenance to a dynamic, data-driven approach. The advent of IoT doesn’t mandate ripping out and replacing existing infrastructure, but it can act as a seamless digital layer, making legacy systems intelligent.

Predictive maintenance 

By connecting to an existing controls infrastructure containing a network of sensors to monitor variables like temperature, humidity, airflow and energy consumption in real-time, IoT can help provide a complete, holistic overview of system performance. This flow of contextualised information enables predictive maintenance strategies, where potential issues are identified and autonomously addressed long before they escalate into catastrophic failures, preventing unplanned downtime and ensuring seamless operation.

This shift from reactive to proactive maintenance is perhaps the most significant operational change. The old model of continue-until-failure was inherently wasteful. It leads to emergency callouts, expensive overtime labour, potential spoilage of goods in retail environments, and severe occupant discomfort. IoT dismantles this model.

The mechanism is precise. A continuous stream of sensor data is analysed by cloud-based algorithms that compare performance against optimal baselines. A slight deviation in, for example, motor temperature or a gradual shift in refrigerant pressure, invisible to the human touch or a monthly inspection, is flagged as a potential future fault. 

The connected system can trigger an automated response, such as adjusting a setting to compensate, while simultaneously generating a detailed work order for an engineer. This allows for a scheduled, low-cost repair weeks before the issue would have caused a disruptive and costly breakdown.

Sustainable approach

The capacity of IoT to significantly reduce the climate impact of built environments is where its value comes sharply into focus. IoT-enabled systems offer precise, real-time control over energy usage, eliminating the guesswork and wasteful practices of outdated management. This control directly reduces energy waste, slashing carbon footprints.

Furthermore, by ensuring systems operate at peak efficiency through continuous optimisation and proactive care, IoT negates the excessive energy consumption typical of poorly maintained or failing equipment. This technology facilitates a more sustainable approach by optimising resource use and minimising waste, allowing organisations to meet ambitious environmental targets without sacrificing operational performance.

This sustainability extends beyond simple energy metrics. For instance, in combined HVAC-R environments, IoT solutions can adjust settings based on specific produce, making informed and precise decisions about temperature control for each item in every unit. This precise, dynamic control prevents energy waste from over-cooling and drastically reduces food spoilage, contributing directly to both sustainability goals and bottom-line cost savings.

The financial argument for IoT-powered HVAC is equally compelling. The integration of smart technology is a powerful antidote to rising operational costs. HVAC systems, when optimised through IoT, consume less energy, translating directly into reduced utility expenses, a critical consideration in today’s economic climate.

Beyond direct energy savings, the business impact is broader. IoT extends the operational lifespan of valuable HVAC equipment by ensuring it is maintained correctly, deferring the need for costly capital replacements. This ability to enhance operations without the massive capital outlay for new infrastructure makes the journey to sustainability and efficiency financially viable for a wider range of businesses.

Redefining manpower

Technological advances are also redefining the role of the HVAC engineer. The professional of the digital age is increasingly a data interpreter, empowered to diagnose issues from a laptop before even setting foot on site. This new skillset requires understanding data from a myriad of sensors and different manufacturers’ control panels, which often use unstandardised data formats.

The solution is controls-agnostic IoT platforms. These systems sit across existing digital infrastructure, connecting directly to assets and translating complex, disparate data into a simple, standardised language for engineers to analyse.

This evolution enhances the engineer’s role tremendously. With remote diagnostics, they can understand the root cause of a fault before dispatching, ensuring they arrive with the correct tools, parts and knowledge. This dramatically increases first-time-fix rates, reduces return visits and cuts down on travel time and associated carbon emissions from service vehicles.

For facilities management contractors and their customers, this increase in engineer efficiency creates a powerful cost incentive and improves the long-term health of HVAC assets, representing a win-win for productivity, profitability and sustainability.

Real energy savings

The benefits of IoT-powered HVAC are not theoretical. A compelling example of this technology in action with one IMS Evolve customer involves a major North American retailer.

The retailer’s challenge was a common one: its existing heating and cooling strategies were not leveraging ambient temperature drift during unoccupied night-time hours, leading to significant energy waste. IMS Evolve implemented an IoT solution that included daily automated health checks on the HVAC fleet. Units with suitable health scores were automatically placed into a night setback programme, safely reducing their load. Crucially, the system managed a staged return to normal setpoints in the morning to prevent damaging energy spikes.

The outcomes were staggering. The initiative delivered $15.1 million in total energy cost savings across 1,800 sites, with an expected saving of $42 million as the solution scales to 5,000 sites. The system’s automated precision ensured a 99.5% return to normal operation by store opening time, with an auto re-run function for any failures achieving a 99.3% success rate.

The future of HVAC is inextricably linked to the continued advancement of IoT and AI. We are moving towards even more sophisticated systems capable of learning from their environments and making autonomous, real-time adjustments to maximise efficiency. 

For facilities managers and engineers, adopting IoT presents an undeniable opportunity to revolutionise building management, turning HVAC systems into a core component of a strategy that achieves operational excellence, financial savings, and meaningful environmental stewardship. 

Lee Harpham, director of refrigeration strategy at IMS Evolve