room dehumidifier

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This page is for room dehumidifier


A dehumidifier removes moisture from the air by passing the moist air over a cold dehumidifying coil. The moisture condenses out of the air on this coil and then drains from the coil into a bucket.

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A dehumidifier reduces the relative humidity of the surrounding air two ways. The removal of moisture from the air ( as described above ) reduces its humidity. The relative humidity of the air is further reduced by heating as the air is discharged over the condenser and out the front. The air is actually heated several degrees in this process. It is normal for the surrounding air to slightly increase in temperature as the dehumidifier operates. This heating effect further reduces the relative humidity of the surrounding air.

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Dehumidifier UK ,
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NN16 8PY

London office: Tel: 01536 484 733
Unit 52 Newark Crescent, Park Royal Ind Est, London, NW10 7BA.



Question & Answers,

Q - Will my desiccant dehumidifier work in a cold room ?

A -  A desiccant dehumidifier will not operate satisfactory in a room that is below 65 degrees F. At this temperature it will become necessary to operate the dehumidifying coil below freezing temperatures in order to reduce the relative humidity to a reasonable valve. Frost on coils usually will appear.

 Q - My unit will not operate at all, help.

A - Unit may be unplugged. House fuse blown or circuit breaker tripped. Check the bucket, it may be full, empty it. Float not inside the bucket properly, adjust the float so it hangs in the bucket properly.

Q - I have frost building up on my coils.

A - Is the air temperature to cold, below 65 degrees? Dirty coils can effect the air flow over the coils, unit may need to be steam washed. Poor air flow from a slow fan can also allow the coils to frost up.

Q - My unit does not seem to remove much moisture. 

A - Poor air flow from a slow fan or the fan motor may have quit completely. Dirty coils, may need to be steam cleaned. Unit too close to the wall giving poor air flow. desiccant dehumidifier s have a compressor inside, it may not be running due to a bad start relay or a bad compressor or faulty float switch. 

Q - My desiccant dehumidifier is making a squealing noise.

A - This often is a bad fan motor. It will need to be replaced.

Q - My desiccant dehumidifier will not collect water and seems to be making a   clicking on and off noise.

A - Often a clicking on and off noise is the compressor trying to start but cannot. Often this can be as minor as a bad start relay or as major as a bad compressor itself. 

Q - My desiccant dehumidifier will not collect water.

A - If the fan is operating ok, some desiccant dehumidifier s have a frost guard switch ( round device attached to the evaporator coils ). If this frost guard opens circuit it will stop the compressor from running at all. A ohm meter can be used to test the frost guard switch.

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Dehumidifier UK is a website to help you find a room dehumidifier .

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  • Below are answers to the sorts of questions that we are often asked by people looking to buy their first desiccant dehumidifier .  We have divided this section into two, desiccant dehumidifier s for the home and desiccant dehumidifier s for unheated or colder areas (i.e. storage, garages, workshops, boats, caravans, holiday homes, conservatories etc.)

    How Dehumidifies work

    As the warm air circulating through your ducts passes over the evaporator coil, it is quickly cooled and can no longer hold as much moisture as it did at a higher temperature. The excess moisture condenses on the outside of the coils and is carried away through a drain. The process is similar to what happens when moisture condenses on the outside of a glass of ice water on a hot, humid day. Occassionally, the drain lines may become clogged and your system will not drain properly. This can result in a drain pan overflow, leading to water leaks in your ceiling or walls. An annual inspection by an experienced technician includes an inspection of your draining system. During the inspection, the technician will treat your draining system with an algaecide to retard the growth of algae, which can clog your system.

    How does a desiccant dehumidifier work?

     A desiccant 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 desiccant 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 as we breath, 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 create 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 industrial dehumidifier do the whole house?

      A industrial dehumidifier creates a volume of dry air in as large a space as its fan can effect.  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 industrial dehumidifier will prevent condensation from appearing around the whole house. 

    What about the black spots of mould on my window and bathroom sealant?

      Mould occurs around 68% 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 at for example the bottom of the stairs will cure the problem in the whole house. 

    Are they expensive to run?

      A dehumidifier costs about 2-3p an hour to run.  You should take into consideration the fact that the commercial dehumidifier will not run all the time, as it will be controlled via its humidistat.  Secondly it is very expensive to heat a damp house and you will see a reduction in your central heating bill when you start to use your commercial dehumidifier . 

    What is the humidistat?

      Just as you have a thermostat that you set on your central heating you have a humidistat on your commercial dehumidifier .  This will allow the portable dehumidifier to turn off and on as required without you having to worry about it. 

    Should I turn the portable dehumidifier on for just a few hours a day?

      No just let the portable dehumidifier decide when to come on using its humidistat.

     Will they help with allergies?

      A best dehumidifier will reduce the relative humidity in the house, which will prevent dust mites and other pests from breeding.  In this way a best dehumidifier can help with allergies.  For more information try our allergy experts 

    Why do unheated areas get separated out?

      A best dehumidifier that can be found in your local high street store is designed for use in your home, which is nice and warm.  In a garage, store, workshop, boat, caravan, holiday home or a conservatory the temperature will drop a lot lower.  Since a portable dehumidifier works by reducing the temperature internally it can easily reduce down to freezing even if the ambient temperature is 10°C.  What you do not want is for your portable dehumidifier to form a block of ice or for you to find a puddle on the floor. 

    What happens when the temperature in the room drops down towards freezing?

      Most portable dehumidifier s designed for use in the home will just stop working and turn themselves off.  Others will try to work and might well suffer from a build up of ice.  Those with a defrost system are likely to only extract a tiny amount of water.


    What is the correct type of commercial dehumidifier to use in these applications?

      You need a machine with a function called hot gas defrost.  If the commercial dehumidifier does not have this then do not buy it.

     How does Hot Gas defrost work?

      Hot gas defrost works by reversing the coils and using the heat from the hot side of the coils to melt the ice to water.  When this is done the heat is returned to the front of the machine to warm the air before it is blown back out. 

    So what temperature will a hot gas defrost system work down to?


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