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2. Heating, ventilation, and air conditioning - Wikipedia

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

   Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...

3. Packaged terminal air conditioner - Wikipedia

   en.wikipedia.org/wiki/Packaged_terminal_air...

   Packaged terminal air conditioner installed in a residential apartment. A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air conditioning system intended to be mounted through a wall. [1] The first practical semi-portable air conditioning unit invented by engineers at Chrysler Motors. It entered the market in ...

4. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]

5. Friedrich Air Conditioning - Wikipedia

   en.wikipedia.org/wiki/Friedrich_Air_Conditioning

   It was once the most high-efficiency room air conditioner made by Friedrich. [10] QuietMaster: Professional grade room air conditioners manufactured from the 1976 until 2010, when it was replaced by the S/M/L chassis Kühl models. They were manufactured in standard (3-speed analog), "Deluxe" (Deluxe was later called 4-Speed), "Programmable ...

6. 16 Things That Have No Business Being As Expensive As They Are

   www.aol.com/finance/16-things-no-business-being...

   Eggs. In 2020, eggs were just $1.45 and this year, they're $3.00. If this seems extreme to you, you haven't been paying attention. Last year, a dozen eggs went for $4.82, suggesting a pretty ...

7. 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.