An air purifier is a device which removes contaminants from the air in a room. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke. Air purifiers may be either small stand-alone units or larger units that can be affixed to an air handler unit (AHU) or to an HVAC unit found in the medical, industrial, and commercial industries.
If the humidity level is below recommended (around 30 to 50 percent) you should use a humidifier to increase humidity till this level. Most popularly, humidifiers are used in colder months to battle dry air and to decrease the negative effects it can have on your health. When the air outside becomes cold during the autumn and winter seasons, it's our standard method to retreat indoors and crank up the heat.
If you have high humidity in your home then you should use a dehumidifier. These appliances remove moisture and help keep desired humidity level. Keeping a balanced humidity limits mold growth reduces uncomfortable muggy conditions, and protects your home from damage.