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  2. Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania

    The Pennsylvania General Assembly met in the old Dauphin County Court House until December 1821 [60] when the Federal-style Hills Capitol, named for Lancaster architect Stephen Hills, was constructed on a hilltop land grant of four acres set aside for a seat of state government in Harrisburg by the son and namesake of John Harris, Sr., a ...

  3. As U.S. heat deaths rise, some landlords oppose right to air ...

    www.aol.com/news/u-heat-deaths-rise-landlords...

    Upgrading a single-family U.S. home to a central air-conditioning system generally costs between $5,000 and $10,000, according to figures from the American Society of Home Inspectors, while an in ...

  4. Packaged terminal air conditioner - Wikipedia

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

    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 1935, and was designed to fit under a window like many modern PTACs. [2]

  5. Variable refrigerant flow - Wikipedia

    en.wikipedia.org/wiki/Variable_refrigerant_flow

    Variable refrigerant flow ( VRF ), also known as variable refrigerant volume ( VRV ), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. [ 1] Similar to ductless mini-split systems, VRFs use refrigerant as the primary cooling and heating medium, and are usually less complex than conventional chiller -based systems.

  6. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    Air conditioning can be achieved using a mechanical 'air conditioner' or by other methods, including passive cooling and ventilative cooling. [ 2][ 3] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC). [ 4] Heat pumps are similar in many ways to air conditioners ...

  7. 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. [28] (Minisplit ...

  8. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    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 ...

  9. Electrical wiring in North America - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring_in_North...

    Furnaces, electric water heaters, heat pumps, central air conditioning units, electric dryers, electric stoves or cooktops, and built-in microwave ovens must be on dedicated circuits. The code provides rules for sizing electrical boxes for the number of wires and wiring devices in the box.

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