21 October 2025
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CIBSE TM65.4 provides vital insights into the life cycle embodied carbon impact of heating, ventilation, and cooling (HVAC) systems typically used in UK office buildings. Developed by Introba and sponsored by CIBSE and Introba, this research helps engineers, designers, and sustainability professionals to make informed decisions that support net zero design goals.
This publication analyses embodied carbon at both product and system levels, drawing on data shared by manufacturers and calculated using the CIBSE TM65 methodology. It compares HVAC systems across two timeframes, a typical building service life (60 years) and a tenancy period (12 years), to show how design strategies influence carbon outcomes over time.
What will you learn from this guidance?
- Gain a clearer understanding of how different HVAC choices affect embodied carbon.
- Utilise results from the early design stage to inform the selection of low-carbon systems.
- Build on a consistent framework that aligns with the wider CIBSE TM65 series.
- Support net zero office design through evidence-based decisions.
The publication is a first step towards understanding the embodied carbon implications of different HVAC design strategies in an office environment. If no EPDs are available, the results of this study can be used at the early design stage, but they should not replace project-specific calculations once a design has become more detailed.
To download the guide visit: https://tinyurl.com/y2bb65ay
