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  2. Free cooling - Wikipedia

    en.wikipedia.org/wiki/Free_cooling

    Free cooling. Free cooling is an economical method of using low external air temperatures to assist in chilling water, which can then be used for industrial processes, or air conditioning systems. The chilled water can either be used immediately or be stored for the short- or long-term. When outdoor temperatures are lower relative to indoor ...

  3. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations, or legal compliance. Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather ...

  4. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

  5. Why Do My Ears Itch? (And How to Make It Stop) - AOL

    www.aol.com/lifestyle/why-ears-itch-stop...

    Key Takeaways: Itchy ears are not uncommon when adjusting to hearing aids, as it takes time for the ear to adjust to the presence of a hearing aid. Other common causes of itchy ears includes ...

  6. Why sudden loud booms sometimes occur when it's very ... - AOL

    www.aol.com/weather/why-sudden-loud-booms...

    This is because snow acts as an insulator when it is deep enough. As little as 6 inches of snow is enough to keep the freezing air from affecting the ground when the temperature drops rapidly ...

  7. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

    www.aol.com/entertainment/20-off-raycon-earbuds...

    These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...

  8. Run-around coil - Wikipedia

    en.wikipedia.org/wiki/Run-around_coil

    Run-around coil. A run-around coil is a type of energy recovery heat exchanger most often positioned within the supply and exhaust air streams of an air handling system, or in the exhaust gases of an industrial process, to recover the heat energy. Generally, it refers to any intermediate stream used to transfer heat between two streams that are ...

  9. Natural Ways to Improve and Maintain Your Hearing - AOL

    www.aol.com/lifestyle/natural-ways-improve...

    Here are some tips that can improve communication: Make eye contact. Get their attention before speaking. Be within 5 to 7 feet. Face your conversation partner. Reduce any background noise ...