Energy Retrofits and Human Health
Doctor’s Orders: The Complex Relationship Between Energy Retrofits and Human Health
The relationship between energy efficiency and human health is one that we are only just beginning to understand in its full complexity. While it’s easy to think of energy retrofits as primarily a means to lower utility bills or reduce carbon emissions, there is an equally powerful, often-overlooked benefit, which is the potential to transform health and well-being. However, as we delve into this connection, we must also confront the reality that improperly implemented retrofits can sometimes lead to unintended consequences, such as damp, mould, and respiratory issues. So, what does the evidence tell us about the link between energy retrofits and health outcomes? And what lessons can we draw to ensure future upgrades improve not just efficiency but quality of life?
A New Perspective on the Importance of Home Energy Retrofits
The House of Commons Business, Energy and Industrial Strategy Committee recently issued a report urging a seven-fold increase in building energy efficiency measures. They highlighted that a large-scale upgrade of the UK’s housing stock is not only critical for achieving net-zero emissions but also essential for addressing fuel poverty and reducing energy costs. But as these reports emphasise, the benefits extend far beyond carbon reduction; they include notable health improvements for residents, particularly for vulnerable groups like the elderly or those with chronic respiratory conditions.
In the UK, it is estimated that poor housing costs the NHS £2.5 billion annually. Improving energy efficiency has the potential to cut this expenditure by reducing health risks linked to cold, damp, and poorly ventilated environments. The question, however, is how significant these health benefits really are, and how they can be maximised.
Retrofitting for Health
Numerous studies have explored the effects of energy retrofits on health, with varying outcomes. For example, social landlord Gentoo found that residents whose homes received energy upgrades frequently reported health improvements. Their study of 200 households that received new boilers and windows indicated a 15% reduction in NHS costs per household, alongside reductions in emergency admissions related to respiratory illnesses.
In a similar study, tenants of Nottingham City Homes who received external wall insulation reported notable improvements in mental well-being, with reduced levels of anxiety and fewer visits to healthcare providers. Meanwhile, the charity National Energy Action found that nearly 700 households who received heating and insulation upgrades showed improvements in physical health, with one-third reporting significant health benefits.
The evidence is not entirely uniform. Some studies have shown little or no measurable health impact, with researchers suggesting that sample sizes or follow-up periods may have been too short to detect changes. Yet, taken together, these findings suggest a positive trend; energy retrofits, when done well, can indeed improve health outcomes.
Retrofitting for Air Quality
One of the more intriguing aspects of energy retrofits is their impact on indoor air quality. Retrofitting measures often reduce draughts and enhance airtightness, which can inadvertently lead to issues with moisture and indoor pollutants if ventilation is not adequately addressed. Open fireplaces or stoves burning solid fuels are a major source of indoor air pollution, releasing particulates, nitrogen dioxide, and other pollutants harmful to human health. By replacing these with cleaner, more efficient heating systems, retrofits can significantly reduce exposure to these pollutants and improve respiratory health.
In some studies, such as one in rural Northern Ireland, retrofits that included ventilation improvements resulted in drier, warmer homes with lower levels of dampness and mould. The benefits of these upgrades extended beyond the individual, improving indoor air quality for entire neighbourhoods where solid fuel burning was a significant contributor to local pollution.
Carmarthenshire’s Transformative Programme
One of the most compelling studies on the health impacts of retrofitting comes from Carmarthenshire County Council in Wales. In a comprehensive, ten-year study involving 30,000 tenants, the council upgraded homes to the Welsh National Housing Standard, implementing measures such as insulation, heating upgrades, and improved ventilation. The study found a 25-30% reduction in emergency hospital admissions for respiratory and cardiovascular issues among residents over 60 whose homes were retrofitted. Notably, homes that received ventilation improvements saw a 57% reduction in emergency respiratory admissions, a testament to the importance of adequate airflow in energy-efficient buildings.
This study, due to its large scale and duration, offers some of the strongest evidence to date that energy retrofits can lead to meaningful health improvements, particularly when ventilation and indoor air quality are prioritised alongside energy efficiency.
Learning from Challenges
However, not all retrofits lead to positive outcomes. Poorly executed retrofits can exacerbate issues with damp, mould, and indoor air pollution if ventilation is neglected. In a subset of the Carmarthenshire study, homes that received cavity wall insulation without adequate ventilation reported worsened health outcomes. This aligns with other findings that show poor-quality installations can trap moisture, leading to mould growth and increased respiratory issues.
Proper ventilation, it seems, is the key to unlocking the health benefits of retrofitting. If homes are tightly sealed without allowing for adequate air exchange, they may become warmer but at the expense of indoor air quality. Research from Cardiff University found that homes with mechanical ventilation systems, even after receiving energy upgrades that reduced air infiltration, maintained stable indoor humidity levels and good air quality.
The Role of PAS 2035 and the Future of Retrofit Standards
To address these issues, the UK introduced PAS 2035, a new standard for domestic retrofits. PAS 2035 requires a “whole house” approach to energy efficiency, ensuring that ventilation is included in any retrofit plan that reduces air leakage to below 5 air changes per hour. This standard aims to prevent the common pitfalls associated with inadequate ventilation, particularly in older homes where draughts may have previously provided a basic level of air exchange.
With PAS 2035, there is a growing emphasis on integrating energy efficiency and ventilation measures to create truly healthy homes. By adhering to these standards, we can ensure that retrofits benefit occupant health while reducing carbon emissions.
A Future Where Homes Enhance Health and Well-Being
The evidence, though still evolving, suggests that energy retrofits have the potential to transform more than just energy bills, they can reshape the way we live, offering us warmer, healthier, and more sustainable homes. Properly executed retrofits, especially when incorporating ventilation, represent a way to reduce healthcare costs, improve quality of life, and lower our environmental impact.
As we move toward a future where retrofits are increasingly necessary, we must learn from both successes and missteps. It is only by balancing energy efficiency with air quality and ventilation that we can fully realise the health benefits of retrofitting.
At Allbrite, we’re committed to providing retrofits that adhere to the highest standards, ensuring that every project we undertake enhances not just the efficiency but also the health and comfort of our clients’ homes. Contact Allbrite today, and let us help transform your home into a model of comfort, sustainability, and efficiency.
