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7
UNDERSTANDING AND USING A DEHUMIDIFIER
How does a dehumidifier work?
There are four types of dehumidifier sold to the domestic market in the UK - Compressor (this
dehumidifier), desiccant, peltier and silica gel.
A compressor based dehumidifier draws the air in from the room over a filter and passes it over some cold
coils similar to the coils on a fridge. As the coils are cold, water condenses and drips into a bucket. The
air is then reheated to room temperature and blown back out of the dehumidifier.
Why does water appear on my windows/cupboards/walls?
It is a basic law of physics that if the surface is cold enough and if there is enough water vapour in the air
then it will condense. This means in the case of windows whether they are double-glazed or not that if the
windows are cold enough and there is enough moisture in the air then condensation will occur.
Where does this water come from?
We all produce water by drying clothes indoors, the boiling of vegetables, showering, rain, calor gas
heating and making cups of tea all produces moisture. It is just an on-going process that never stops.
Can I just get rid of it by opening my windows?
This is fine on a nice summers day but in winter opening your windows will just result in you losing the
heat from your central heating and creating draughts. This is a waste of money and if it is raining will just
let more moisture in. You might as well just throw fivers out of the window.
Will a dehumidifier do the whole house?
A dehumidifier creates a volume of dry air in as large a space as its fan can effect (this dehumidifier can
control up to a large 5 bedroom house). After that it will be helped by the fact that damp air will always
migrate to dry places. As long as you leave all of the internal doors open a correctly sized dehumidifier
will prevent condensation and mould from appearing around the whole house.
What about the black spots of mould on my window and bathroom sealant?
Mould occurs around 68% relative humidity, condensation occurs at 100%. As you can see from this you
can have mould but still have clear windows. A dehumidifier will prevent the mould from getting any
worse and once you have cleaned the mould away, it will stop it from coming back.
Do I put it in the worst room?
You can if you like put it in the main problem area to start with and then move it somewhere more
convenient when you feel that the problem is under control. If it is just condensation on the windows that
you are worried about a dehumidifier in a central position, for example the bottom of the stairs will cure the
problem in the whole house.
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