Buy dehumidifier
Some dehumidifiers can consume more than $150 a year in energy, so look for the models that posted the best efficiency scores in our test. Buy the largest-capacity dehumidifier you can afford. It will work quicker and more efficiently than a smaller unit, and it will be able to handle a greater range of humidity levels with little or no added noise.
Dehumidifiers are used to remove moisture from indoor air. They are typically used to address moisture problems such as window condensation and comfort problems associated with high relative humidity. Dehumidifiers can also help keep a damp basement dry. Water comes in three forms: ice, liquid and vapor. Water vapor is a gas that easily mingles with air. Humidity is the amount of water vapor in the air. It is normally measured as relative humidity (RH). RH is a percentage that indicates the amount of moisture in the air relative to the maximum amount the air can hold at that temperature. For instance, when air at a given temperature contains all the water vapor it can hold at that temperature, it has a RH of 100 per cent. If the humidity exceeds 100 per cent, moisture will begin to condense from the air. If the air contains only half the water it can hold at that temperature, the RH is 50 per cent.
Heat-pump dehumidifiers are the most common. They are relatively complex machines that have a heat pump; two sets of coils; a motor-fan that moves air through it; a control system and panel; and a water bucket and drain system. Chemical adsorbent dehumidifiers absorb moisture from the air with a “desiccant” — a drying agent such as silica gel. The desiccant is on a heat exchange wheel. A separate air loop dries the desiccant in the wheel and exhausts the hot, damp air outdoors through special ducting.
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