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                     Air Source Heat Pumps 
An air source heat pump is a device that uses a small amount of energy to 
move heat from one place to another. The heat pump is the most common 
type of equipment used for heating and cooling in residential and 
commercial buildings. Air source heat pumps are also used in industrial 
and agricultural settings. Heat pumps are used to transfer heat from the air 
ground or water to a building or process. 
 
What is an Air Source Heat Pump? 
An Air Source Heat Pump (ASHP) is a device that transfers heat from the 
outside air to heat a building or vice versa. In heating mode it extracts heat 
from the outside air and transfers it via a refrigerant to the inside of the 
building. In cooling mode it does the reverse - absorbs heat from the inside 
of the building and transfers it to the outside air. ASHPs can be used for 
both space heating and cooling as well as for domestic hot water 
production. 
 
How Air Source Heat Pumps Work 
Air source heat pumps (ASHPs) are electrically powered systems which 
extract heat from the air outside and use it to heat your home and provide 
hot water. 
They work by using a refrigerant gas which is compressed at a high 
temperature causing it to turn into a liquid. This liquid then passes through 
a series of coils and fans extracting heat from the air as it evaporates back 
into a gas. The gas is then passed through a compressor where it is 
compressed again causing it to turn back into a liquid. 
The hot liquid is passed through a series of pipes inside your home where it 
transfers its heat to the air water or radiators heating your home in the 
process. 
 
Advantages of Air Source Heat Pumps 
Air source heat pumps (ASHPs) are a highly efficient cost effective and 
environmentally friendly heating and cooling solution. ASHPs work by 
extracting heat from the air outside and using it to heat your home in the 
winter or cool your home in the summer. In addition to providing heating 
and cooling ASHPs can also provide hot water. 
ASHPs are significantly more efficient than traditional fossil fuel-based 
heating and cooling systems such as furnaces and air conditioners. ASHPs 
can reduce your heating and cooling costs by up to 50% compared to these 
traditional systems. In addition ASHPs do not produce any emissions 
making them a much more environmentally friendly option than fossil fuel-
based systems. 
 
Disadvantages of Air Source Heat Pumps 
There are a few disadvantages to air source heat pumps. One is that they 
can be noisy both inside and outside the home. Another is that they require 
regular maintenance such as cleaning the filters and coils to keep them 
running efficiently. Additionally they are not as effective in very cold 
climates and may require a backup heating system. 
 
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