A home that is more complex or costly to improve, often because of solid walls, unusual construction, access issues or heritage restrictions.
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A heat pump that collects heat from the ground using buried pipework, boreholes or collector loops.
Pipework buried in the ground that collects heat for a ground source heat pump.
A measure of how much heat a greenhouse gas traps in the atmosphere compared with carbon dioxide.
The glass part of a window or door. Double and triple glazing reduce heat loss compared with single glazing.
A boiler that burns mains gas to provide heating and hot water.
A situation where a household struggles to afford adequate heating and energy services.
Insulation added to solid floors, suspended timber floors or between floor joists to reduce heat loss.
The temperature of water leaving a boiler or heat pump to supply radiators, underfloor heating or hot water systems.
The amount of water moving through a heating system over a set time.