An area such as a loft, garage, cellar or porch that is not normally heated.
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Underfloor Heating
A heating system with pipes or electric elements installed in or under the floor. Wet underfloor heating can work well with heat pumps because it can run at low temperatures.
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U-Value
A measure of how much heat passes through a building element, such as a wall, roof, floor, window or door. The lower the U-value, the better the insulation performance.
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Underfloor Insulation
Insulation installed below a floor, commonly between suspended timber floor joists.
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TrustMark
A UK government-endorsed quality scheme used for many retrofit and energy-efficiency works.
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Trickle Vent
A small controllable vent, usually in a window frame, that provides background ventilation.
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Timber Frame
A construction type where the main structural frame is made from timber.
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Thermostatic Radiator Valve
A valve fitted to a radiator that helps control the temperature in an individual room.
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Thermostat
A control that turns heating on or off, or modulates it, based on temperature.
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Thermal Mass
The ability of materials such as brick, concrete or stone to absorb, store and release heat.