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  2. List of Washington (state) area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Washington_(state...

    The U.S. state of Washington has six telephone area codes. The state initially used a single area code until it was divided in 1957 with the creation of area code 509 to serve Eastern Washington. In 1995, 206 was split again to serve just the Puget Sound region after area code 360 was created for the remainder of Western Washington.

  3. Heating, ventilation, and air conditioning - Wikipedia

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

    Electrical heaters are often used as backup or supplemental heat for heat pump systems. The heat pump gained popularity in the 1950s in Japan and the United States. [14] Heat pumps can extract heat from various sources, such as environmental air, exhaust air from a building, or from the ground. Heat pumps transfer heat from outside the ...

  4. Trane - Wikipedia

    en.wikipedia.org/wiki/Trane

    Map of the Channel Tunnel The Channel Tunnel is a 50.45-kilometre (31.35 mi) rail tunnel beneath the English Channel , linking the United Kingdom with France. At its lowest point, it is 75 m (250 ft) below the sea bed and 115 m (380 ft) below sea level.

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  6. Area code 207 - Wikipedia

    en.wikipedia.org/wiki/Area_code_207

    The numbering plan area retains its original boundaries, having never been split or overlaid. As of April 2020, area code 207 is not threatened by office code exhaustion until the first quarter of 2027. [1] [2] The deadline has been extended several times due to technical changes and number pooling. [3] Some small Maine communities near the ...

  7. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    In general, heat pumps work most efficiently (that is, the heat output produced for a given energy input) when the difference between the heat source and the heat sink is small. When using a heat pump for space or water heating, therefore, the heat pump will be most efficient in mild conditions, and decline in efficiency on very cold days.

  8. Space heater - Wikipedia

    en.wikipedia.org/wiki/Space_heater

    A space heater is a device used to heat a single, small- to medium-sized area. [1] This type of heater can be contrasted with central heating , which distributes heat to multiple areas. Types

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