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  2. Don't wait until the next heat wave to buy an AC — this one ...

    www.aol.com/lifestyle/midea-air-conditioner-sale...

    This Midea window air conditioner is the perfect size for a bedroom, kitchen or even a smaller living room. Normally $175, it's now marked down on Walmart to just $144, making it quite the steal ...

  3. Sound attenuator - Wikipedia

    en.wikipedia.org/wiki/Sound_attenuator

    A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

  4. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    In acoustic cavity and duct-based systems, the number of nodes grows rapidly with increasing frequency, which quickly makes active noise control techniques unmanageable. Passive treatments become more effective at higher frequencies and often provide an adequate solution without the need for active control.

  5. Walmart Is Taking up to 46% Off Top-Rated Air Conditioners - AOL

    www.aol.com/walmart-taking-46-off-top-133500803.html

    Walmart is taking up to 46% off portable air conditioners as temperatures start rising ahead of summer.

  6. Acoustic foam - Wikipedia

    en.wikipedia.org/wiki/Acoustic_foam

    A close-up image of acoustic foam. Acoustic foam is an open celled foam used for acoustic treatment. It attenuates airborne sound waves, reducing their amplitude, for the purposes of noise reduction or noise control. [1] The energy is dissipated as heat. [2] Acoustic foam can be made in several different colors, sizes and thickness. [3]

  7. Looking for a Respite From The Heat? Walmart Has Air ... - AOL

    www.aol.com/looking-respite-heat-walmart-air...

    Walmart is taking up to 46% off portable air conditioners as temperatures start rising ahead of summer.

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