HVAC energy efficiency: reducing consumption in existing systems with advanced control technologies
Strategies and technologies for modernising heating and cooling systems in residential and commercial buildings.
Many facilities still use outdated systems designed for constant-load operation that lack intelligent control systems. Retrofitting HVAC systems is still one of the most effective ways to reduce energy consumption and emissions in existing buildings.
Today, modernizing pumps and control systems enables significant energy savings to be achieved without having to completely replace the entire existing infrastructure. However, the perceived high upfront costs, system complexities and lack of specialised expertise continue to act as a barrier and slow down such initiatives.
Tangible energy savings
Upgrading fixed-speed pumps or those with IE1/IE2 motors to ECM circulators typically results in 30-60% reduction in electricity consumption.
Efficiency is further enhanced by variable-speed drives and variable Δp control logic, which adjusts pressure and flow rate according to actual system demand, optimizing operation during partial-load periods.
In addition to energy savings, system modernisation ensures:
- Greater reliability
- Reduced noise levels
- Lower maintenance costs
- Continuous digital monitoring
- Support for predictive maintenance
IE5 motors and intelligent control
Pairing ultra-premium efficiency IE5 motors with next-gen inverters represents the most advanced standard for HVAC applications today.
Integrated solutions such as Lowara’s hydrovar® X combine an IE5 synchronous motor and variable speed control into a single intelligent system capable of optimising the entire hydraulic circuit.
Key advantages include:
- Adaptive pressure and flow rate regulation
- Simplified commissioning
- Multi-pump management
- BMS integration via Modbus and BACnet
- Wide retrofit compatibility
In redevelopment projects, ease of installation and configuration offers a tangible advantage by reducing downtime and the risk of errors.
Smart retrofitting and digitalisation
In many buildings the installed hardware is still functional, but the operating system is obsolete; in cases like this, introducing smart controls makes it possible to significantly improve performance without having to replace the entire system.
The new hydrovar® X+ Smart Controller is specifically designed to optimise the dynamic behaviour of pumps by adapting them to variable loads in real time.
Digitisation enables:
- Continuous performance monitoring
- Early detection of anomalies
- Predictive maintenance
- Remote management
- Integration with heat pumps and renewable energy sources
Sustainability and Lifecycle
Modernisation decisions can no longer be based on initial cost alone. An increasing number of companies and investors are evaluating the total cost ownership (TCO) and the environmental impact over the duration of plant’s entire lifecycle.
Tools such as LCAs and reports aligned with Product Category Rules (PCRs) make it possible to calculate energy consumption, CO2 emissions, and the environmental impact of HVAC solutions while also supporting ESG goals and building sustainability certifications.
Simplifying to accelerate the energy transition
The growing demand for energy retrofitting will require technologies that are becoming increasingly simple to install and manage.
Plug-and-play solutions, intuitive interfaces, and integrated control systems help reduce operational complexity and reliance on hard-to-find specialist expertise.
The energy transition of buildings will also depend on the ability to make highly efficient HVAC technologies accessible, accelerating the reduction of energy consumption and emissions within the existing building stock.