Introducing low-carbon heating to the Cathedral estate as part of our journey to net zero.
The Challenge
As part of its commitment to reach net zero carbon by 2030, Chichester Cathedral has been reviewing how energy is used across its wider estate.
Many residential properties within the Cathedral Close rely on traditional gas boilers. While functional, these systems contribute to carbon emissions and rising energy costs. Transitioning to low-carbon heating in historic settings presents both financial and practical challenges — particularly where insulation and building fabric must also be considered.
Meaningful progress required a demonstrator project.
The Solution
In 2024, an air source heat pump (ASHP) was installed in a residential flat on the Cathedral estate — the first heating-focused carbon reduction project of its kind on Cathedral property.
An air source heat pump extracts heat from the outside air, even in cold weather, and uses it to warm the home. The system replaces a gas boiler with an energy-efficient electric alternative, significantly reducing carbon emissions.
To maximise efficiency, the project adopted a ‘fabric first’ approach:
- Internal wall insulation was installed to improve thermal performance.
- Existing radiators were replaced with aluminium models designed specifically for heat pump systems.
Thanks to the Government’s £7,500 Boiler Upgrade Scheme grant, the cost of installation was comparable to that of a new gas boiler.
The Impact
This project represents an important early step in decarbonising the Cathedral estate.
It has:
- Reduced reliance on fossil fuels
- Improved energy efficiency and comfort within the property
- Demonstrated how renewable technology can be sensitively integrated within a historic setting
- Created a model for future low-carbon upgrades across residential and operational buildings
While modest in scale, the installation signals long-term commitment and practical action.
Funding & Partnership
The project was made possible through funding support from the Chichester Cathedral Restoration & Development Trust and a grant from the Department for Energy Security and Net Zero via the Boiler Upgrade Scheme.
However, beyond limited government schemes, there is currently no central funding dedicated to supporting the Cathedral’s wider transition to low-carbon infrastructure.
Future sustainability projects will depend significantly on philanthropic support.
Looking Ahead
The Cathedral has already achieved Gold Eco Church status and completed a major LED lighting upgrade. The installation of this first air source heat pump marks the beginning of a broader programme of sustainable heating and insulation improvements.
Reaching net zero by 2030 will require continued investment, innovation and partnership.
Support Our Journey to Net Zero
Reducing the Cathedral’s environmental impact while protecting its historic buildings relies on the generosity of those who share our commitment to caring for creation.
Your gift can help fund future heat pump installations, insulation upgrades and other vital sustainability projects.
Chichester Cathedral Restoration & Development Trust CIO
Registered Charity No. 1156729
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