Conservation & Heritage Issue 50 Winter 2025/Spring 2026 - Flipbook - Page 24
5. Carbon reduction options
5.4 Renewable systems
Once the model has been refined as far as possible, it allows
us to test alternative carbon reduction measures, estimating
the likely energy saved, budget capital cost and economic
payback.
Replace all fossil fuel heating and hot water systems with
electric, from a 100% renewable supplier.
Depending on the occupancy pattern, determine whether
to heat the space or the people. If the former, then direct
electric radiant heating could be the most appropriate. If the
latter, then air source or ground source heat pumps would
be the most effective, serving radiators or convector heaters.
5.1 Good housekeeping
Minimal cost:
− Simple draughtproofing
− Presence detection light switches in circulation areas
− Reducing room temperatures
− Reducing heating run hours
− Timeclocks on water heaters
− ….and others
The increased consumption and cost of electricity with an
all-electric heating system could be offset by the installation
of roof-mounted solar PV panels, with or without battery
storage. If there is a sufficient hot water demand, roof
mounted solar thermal heating could be considered. Both
systems would be subject to planning restrictions.
5.2 Passive design
We consider the potential for improving building energy
performance though sensitive fabric improvements.
− Secondary or conservation double/triple glazing
− Internal wall insulation
− Roof insulation
6. Reporting
A detailed report will be provided outlining all the above,
including a description of the options considered, concept
diagrams and schedules of capital cost, projected cost and
carbon savings, and economic payback.
5.3 Efficient services
If required, the report can be presented in person so that the
findings can be discussed to assist in future decision making.
These would include:
− Replacing all lighting with LED fittings
− Mechanical ventilation systems to include heat recovery
to preheat fresh air intake
− Consider intelligent controls appropriate to the
complexity of the building systems
Below, Epping Forest District Museum, image © Tim Crocker
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