Heat recovery ventilation solutions can significantly reduce the energy required for heating and cooling in well-insulated, airtight buildings. In addition to delivering energy and cost savings for building occupants, these reductions result in avoided carbon emissions compared with conventional, baseline ventilation.

Building on the methodology developed in collaboration with engineering consultants Arup, we have again calculated the avoided emissions associated with heat recovery products sold during FY26, using updated carbon conversion factors and assessing the emissions avoided over the expected lifetime of those products.

The benefits of heat recovery extend throughout the useful life of each product, meaning that the associated emissions reductions are not limited to the year of sale or installation. Furthermore, as the installed base of heat recovery products increases through successive years of sales, the potential for cumulative emissions reductions also grows. For FY26, our assessment focuses on the lifetime avoided emissions associated with heat recovery products sold during the year.

The equivalent number of homes and cars presented alongside our avoided emissions estimate is intended to provide a relatable illustration of the scale of the impact. These estimates are subject to the same assumptions, limitations and sensitivities as the underlying avoided emissions calculation. They also depend on assumptions relating to average emissions from homes and cars, based on data published by the Office for National Statistics (ONS) and the Department for Transport (DfT).  

Definition – avoided emissions

The emissions estimated to be avoided through the use of Volution Group heat recovery products, compared with alternative ventilation solutions.

Avoided emissions are not included within the Group’s Scope 1, Scope 2 or Scope 3 emissions and do not form part of the Group’s total emissions or net zero targets. 

1,618,644 tCO₂e

Avoided emissions from the use of our heat recovery products sold in FY25 over their lifetime of use

>0.5 million

homes’ carbon dioxide emissions for 1 year¹

The same as:


or

>0.8 million

cars off road for 1 year²

1. Calculated by taking the Volution reported avoided emissions of 1,618,644 tCO₂e and dividing by the median emissions for an existing dwelling in England for one year (ONS, 2025).

2. Calculated by taking the Volution reported avoided emissions of 1,618,644 tCO₂e and dividing by the overall average emissions per mile for UK diesel automobiles (DfT, 2024) assuming 7,000 miles driven per annum per vehicle (DfT, 2024).