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Indoor Air Quality
How does a dehumidifier work?
  The way a dehumidifier works is similar to the way condensation forms on a cold window. A dehumidifier contains a compact refrigeration system which makes it the coldest place in the house. Air is drawn into the cold dehumidifier where any moisture in the air condenses on the hydrophilic coils and is collected on the easy pour container.
Would I need to run a dehumidifier all the year round?
  Running a dehumidifier from early October until the spring is generally sufficient as more moisture is generated during the summer weather. It's also better to start using your dehumidifier before the winter starts; this reduces the risk of moisture soaking into your walls. If you do start your dehumidifier part way through the winter it is advisable to run it continuously for around 2 weeks to ensure your home is properly dried out.