Low-level ventilation, usually through trickle vents or wall vents, that helps provide fresh air and manage moisture.
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Asbestos Check
A safety check to identify materials that may contain asbestos before retrofit works are carried out.
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Assessment
A detailed inspection of a property to understand its current condition, energy performance, heating systems, insulation, ventilation and retrofit suitability.
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Ambient Temperature
The surrounding air temperature. In heating, this often means the outside air temperature.
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Air Tightness Test
A pressure test used to measure how leaky a building is. A fan is usually fitted into a doorway to pressurise or depressurise the property.
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Air Tightness
How well a building prevents uncontrolled draughts and air leakage. Good airtightness helps reduce heat loss but must be balanced with suitable ventilation.
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Air Source Heat Pump
A low-carbon heating system that takes heat from the outside air and upgrades it to heat the home and hot water.
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Air Permeability
A measure of how much air leaks through the gaps and cracks in a building. Lower air permeability usually means a more airtight home.
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Air Changes per Hour
The number of times the air inside a room or building is replaced in one hour. It is used when looking at ventilation, air quality and heat loss.