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  2. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    The packaged terminal air conditioner (PTAC), through-the-wall, and window air conditioners are similar. These units are installed on a window frame or on a wall opening. The unit usually has an internal partition separating its indoor and outdoor sides, which contain the unit's condenser and evaporator, respectively.

  3. Fan coil unit - Wikipedia

    en.wikipedia.org/wiki/Fan_coil_unit

    These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.

  4. 5 things you should (and should not) do to make your AC unit ...

    www.aol.com/news/5-things-not-ac-unit-140622695.html

    5 expert tips for making your air conditioning unit run better. Here’s what Smith recommends: 1. Annual maintenance: “Have a professional come check the controls to make sure the electricity ...

  5. Standing wave - Wikipedia

    en.wikipedia.org/wiki/Standing_wave

    The standing wave with n = 1 oscillates at the fundamental frequency and has a wavelength that is twice the length of the string. Higher integer values of n correspond to modes of oscillation called harmonics or overtones. Any standing wave on the string will have n + 1 nodes including the fixed ends and n anti-nodes.

  6. African Americans - Wikipedia

    en.wikipedia.org/wiki/African_Americans

    Unlike slaves, they were freed after their term of service expired or if their freedom was purchased. Their children did not inherit their status, and on their release from contract they received "a year's provision of corn, double apparel, tools necessary", and a small cash payment called "freedom dues". [ 28 ]

  7. Palm Springs, California - Wikipedia

    en.wikipedia.org/wiki/Palm_Springs,_California

    The homeowner vacancy rate was 6.7%; the rental vacancy rate was 15.5%. 24,948 people (56.0% of the population) lived in owner-occupied housing units and 19,065 people (42.8%) lived in rental housing units. During 2009–2013, Palm Springs had a median household income of $45,198, with 18.2% of the population living below the federal poverty line.

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