What is heat recovery ventilation?
Heat recovery ventilation (HRV) is a mechanical ventilation system designed to improve indoor air quality while minimising heat loss. It works by extracting stale, warm air from inside a home and using that air to preheat incoming fresh air from outside. The two air streams pass through a heat exchanger, allowing heat to transfer without the air mixing.
According to the UK’s Energy Saving Trust, heat recovery ventilation systems “recover heat that would otherwise be lost and use it to warm incoming fresh air,” helping maintain a comfortable indoor temperature while ensuring a continuous supply of fresh air.
This makes HRV systems particularly suited to modern, well insulated homes where natural ventilation is limited.
HRV systems typically consist of ducting, fans and a central heat exchanger unit. They run continuously at a low rate, extracting moisture and pollutants from areas such as kitchens and bathrooms while supplying filtered air to living spaces and bedrooms.
Filters within the system can also reduce outdoor pollutants such as pollen and dust entering the home.
Do all new homes have heat recovery ventilation?
Not all new homes are equipped with heat recovery ventilation, although their use is becoming more common. Building regulations in the UK, such as Approved Document F (Ventilation), require adequate ventilation in new dwellings, but they do not mandate HRV systems specifically.
According to the UK Government’s building regulations guidance, ventilation can be achieved through a range of methods, including natural ventilation (e.g. trickle vents and opening windows), intermittent extract fans, or continuous mechanical systems like HRV. The choice depends on factors such as building design, airtightness, and developer preferences.
However, as homes become more energy efficient and airtight - particularly those built to standards such as Passivhaus - HRV systems are increasingly adopted.
The Passivhaus Trust states that mechanical ventilation with heat recovery is a core component of Passivhaus design because it ensures consistent air quality without compromising energy efficiency.
In practice, many new build homes in the UK still rely on simpler ventilation strategies due to lower upfront costs. HRV systems are more commonly found in high performance or custom built homes where long term energy savings and indoor air quality are prioritised.
How does heat recovery ventilation help with sustainability?
Heat recovery ventilation contributes to sustainability primarily by improving energy efficiency and reducing heat loss. In conventional ventilation, warm indoor air is expelled and replaced with cold outdoor air, increasing the demand for heating. HRV systems reduce this energy loss by transferring heat from outgoing air to incoming air.
According to the International Energy Agency (IEA), improving ventilation efficiency is an important factor in reducing building energy consumption, as heating and cooling account for a significant proportion of residential energy use. By recovering heat that would otherwise be wasted, HRV systems can lower overall heating demand.
In addition to energy savings, HRV systems support better indoor environmental quality. Continuous ventilation helps remove excess moisture, reducing the risk of condensation and mould growth. The NHS highlights that damp and mould in homes are associated with respiratory issues, so improved ventilation can have health benefits alongside environmental ones.
HRV systems also incorporate air filtration, which can reduce exposure to outdoor air pollution. This is particularly relevant in urban areas where pollutants such as nitrogen dioxide and particulate matter are more prevalent. Cleaner indoor air can contribute to occupant wellbeing, which is increasingly recognised as part of sustainable building design.
However, the sustainability benefits depend on correct installation, maintenance and operation. Filters must be cleaned or replaced regularly, and systems must be properly balanced to ensure efficiency. According to the Chartered Institution of Building Services Engineers (CIBSE), poorly installed or maintained systems may not deliver the expected energy savings.
Overall, heat recovery ventilation is a technology that aligns with the broader goal of reducing energy consumption in buildings while maintaining healthy indoor environments. Its adoption is likely to increase as building standards tighten and the focus on low carbon housing grows.
Disclaimer
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Publish date 29th April, 2026
Reading time: 4 minutes
Written by Vicki England
