A certification scheme covering low-carbon technologies such as heat pumps, solar PV and battery storage.
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Mechanical Ventilation with Heat Recovery
A ventilation system that extracts stale air and supplies fresh air while recovering heat from the outgoing air.
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Mechanical Extract Ventilation
A ventilation system that continuously extracts air from wet rooms such as kitchens, bathrooms and utility rooms.
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Low Temperature Heating
A heating system designed to work with lower water temperatures. Heat pumps are most efficient when supplying low flow temperatures.
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Low Carbon Heating
Heating that produces lower carbon emissions than traditional fossil fuel systems. Examples include heat pumps, heat networks and some biomass systems.
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Loft Insulation
Insulation installed at ceiling level or roof level to reduce heat loss through the roof.
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Listed Building
A building protected because of its special architectural or historic interest. Retrofit work may need special permissions and sensitive design.
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Lime Plaster
A traditional breathable plaster often used in older solid-wall buildings.
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Lambda Value
A measure of a material’s thermal conductivity. Lower lambda values mean the material is better at resisting heat flow.
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Kilowatt Hour
A unit of energy. Energy bills usually charge for electricity or gas in kWh.