Archives: Glossary

A unit of power. Heating system output is usually measured in kilowatts.

A point where building elements meet, such as wall-to-roof, wall-to-floor or window-to-wall. Junctions are important for heat loss and thermal bridging.

A variable-speed compressor used in many heat pumps. It can adjust output to match demand more efficiently.

Insulation fitted to the inside face of external walls. It can improve thermal performance but must be designed carefully to manage moisture risk.

A fan that runs when needed, usually when a bathroom or kitchen is being used.

Material used to slow down heat loss. Common examples include mineral wool, PIR, phenolic board, EPS, XPS, wood fibre, hemp, sheep’s wool and cellulose.

Plasterboard with insulation bonded to the back. It is often used internally on walls or ceilings.

Electric heating panels that warm people and surfaces directly using radiant heat.

The quality of the air inside a home. It can be affected by moisture, ventilation, pollutants, mould, combustion appliances and occupancy.

A heating system that combines two technologies, such as a heat pump and a gas boiler.