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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]
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 ...
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 ...
Air naturally stratifies, i.e. warmer air rises to the ceiling while cooler air sinks, meaning that colder air settles near the floor where people spend most of their time. A ceiling fan, with its direction of rotation set so that the warmer air on the ceiling is pushed down along the walls and into the room, heating the cooler air.
Hitachi maintained a 40% stake in the resulting company, Johnson Controls-Hitachi Air Conditioning. [45] In May 2016, Hitachi announced it was investing $2.8 billion into its IoT interests. [46] Hitachi’s rail business in Europe, especially in the United Kingdom, expanded in the 2010s, with Hitachi Newton Aycliffe starting operations in ...
A man-at-arms was a soldier, well-versed in the use of arms, who served as a fully-armoured heavy cavalryman. The term man-at-arms denoted a military function, rather than a social rank. [134] By the 16th century men-at-arms carrying the lance were displaced by lightly armoured, or later unarmoured, soldiers employing firearms and a sword. [135 ...
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