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  2. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    A year later, multiple sources for the hum were identified in Darmstadt: two faulty air conditioner units, a faulty heat pump, and three structural noise protection measures on energy generation plants. [16] In 2022, hums were reported in St. Louis County, Missouri and surrounding areas. [17] In 2023, a hum was reported in Omagh in Northern ...

  3. 6 things you should do to make sure your air conditioner is ...

    www.aol.com/news/6-things-sure-air-conditioner...

    First, do not put any lamps or televisions near the air conditioner. The thermostat on the unit can sense any heat emitting from those objects and can cause the air conditioner to work overtime ...

  4. Fan coil unit - Wikipedia

    en.wikipedia.org/wiki/Fan_coil_unit

    A unit ventilator is a fan coil unit that is used mainly in classrooms, hotels, apartments and condominium applications. A unit ventilator can be a wall mounted or ceiling hung cabinet, and is designed to use a fan to blow outside air across a coil, thus conditioning and ventilating the space which it is serving.

  5. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

  6. Mains hum - Wikipedia

    en.wikipedia.org/wiki/Mains_hum

    Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.

  7. The 12 Best Cool-Mist Humidifiers That Will Become the Unsung ...

    www.aol.com/12-best-cool-mist-humidifiers...

    Amazon. ATTN: Allergy sufferers. This Levoit humidifier has a 360-degree rotating nozzle that spreads an ultra-fine cool mist into the air for fast relief from allergens.

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