Why Low-Temperature Systems Are Gaining Ground

Low-temperature heating and cooling are increasingly seen as the future of HVAC design. Systems operating at around 35–55°C for heating and 14–18°C for cooling align better with modern efficiency and sustainability targets.

This shift is largely driven by the rise of heat pumps, which perform significantly better at lower temperatures, and by regulations that prioritise reduced energy consumption and carbon emissions.

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The Efficiency Benefits Of Lower Temperatures

Reducing supply temperatures improves overall system efficiency by lowering distribution losses and enhancing the performance of generation units. It also enables better integration with renewable energy sources.

In practice, low-temperature systems can:

reduce energy losses in distribution networks
improve seasonal efficiency of heat pumps
support more stable operation under varying loads

See how modelling supports efficient low-temperature HVAC design ›

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What Changes In System Design

Transitioning to low-temperature operation requires more than adjusting setpoints. It affects the entire HVAC system, including emitters, flow rates and control strategies.

Designers must consider whether existing emitters can deliver sufficient output at lower temperatures and how system hydraulics should be adapted. Without these adjustments, the expected efficiency gains may not be realised.

System-level modelling is often used to test different configurations and ensure that comfort and performance are maintained throughout the year.

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What This Means For Future HVAC Projects

As regulations tighten and electrification accelerates, low-temperature systems are likely to become the default approach in both new builds and retrofits. Designing for these conditions early helps avoid costly redesigns and ensures long-term performance.

Explore how simulation supports future-proof HVAC system design ›

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FAQ: Low-Temperature HVAC Systems

Will All Buildings Need To Switch To Low-Temperature Systems?

Not immediately, but most new systems are already being designed for lower temperatures. Existing buildings may require upgrades to operate efficiently under these conditions.

Do Low Temperatures Affect Comfort?

Not if systems are properly designed. With the right emitters and controls, comfort levels can remain consistent or even improve.

Are Low-Temperature Systems Only Relevant For Heat Pumps?

They are most commonly associated with heat pumps, but they also improve efficiency in other system types by reducing losses and enhancing control stability.

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