Energy from sources that naturally replenish, such as sunlight, wind, water and ambient heat.
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An external finish applied to walls. It may be used as part of an external wall insulation system.
The amount of moisture in the air compared with the maximum amount it could hold at that temperature.
The process used by heat pumps, fridges and air conditioners to move heat. The main stages are compression, condensation, expansion and evaporation.
The working fluid inside a heat pump or refrigeration system. It absorbs and releases heat as it changes pressure and state.
Reduced Data Standard Assessment Procedure. The method used to assess the energy performance of existing UK homes for EPCs.
A heat emitter that transfers heat from hot water into a room.
Checks carried out to make sure retrofit work has been assessed, designed, installed and recorded correctly.
A measure of heat loss at junctions between building elements, such as around windows or where walls meet floors.
Energy measured before losses from generation, conversion and distribution are considered.