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2. AOL reviewed: This smart humidifier helps me sleep better in ...

   www.aol.com/lifestyle/levoit-dual-200s-smart...

   The Levoit Duual 200S Smart Humidifier is a compact and reasonably priced mister that can help maintain comfortable humidity levels in your home.

3. Humidifier - Wikipedia

   en.wikipedia.org/wiki/Humidifier

   A humidifier is a household appliance or device designed to increase the moisture level in the air within a room or an enclosed space. It achieves this by emitting water droplets or steam into the surrounding air, thereby raising the humidity .

4. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

5. Heat Up Energy Savings by Investing in a Humidifier ... - AOL

   www.aol.com/news/2012-09-05-save-on-heating...

   Based on national averages, it costs about $200 per month to heat your home to 72 degrees, while it costs just $144 per month to heat it to 65 degrees. That will save you as much 28 percent off ...

6. Heat recovery ventilation - Wikipedia

   en.wikipedia.org/wiki/Heat_recovery_ventilation

   Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...

7. Heat and moisture exchanger - Wikipedia

   en.wikipedia.org/wiki/Heat_and_Moisture_Exchanger

   The basic components of heat and moisture exchangers are foam, paper, or a substance which acts as a condensation and absorption surface. The material is often impregnated with hygroscopic salts such as calcium chloride, to enhance the water-retaining capacity. HMEs used for laryngectomees are mostly hygroscopic.