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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] PTACs are commonly found in commercial settings (hotels, motels, hospitals), or multifamily facilities (senior housing, condominiums, apartment ...
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Air conditioners, which typically use vapor-compression refrigeration, range in size from small units used in vehicles or single rooms to massive units that can cool large buildings. [6] Air source heat pumps, which can be used for heating as well as cooling, are becoming increasingly common in cooler climates.
Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.
One – I (I is the Roman numeral for 1) or rarely A, AN (not normally used in British crosswords), ACE (playing card), UNIT; Operating system – OS; Operation – OP; Order – OM (Order of Merit) Ordinary Seaman – OS, Rating; Oriental – E (East) Other Ranks – OR (military term for non-commissioned ranks) Ounce – OZ (abbreviation ...
Download QR code; Print/export Download as PDF; ... move to sidebar hide. Cooling unit may refer to: Air conditioner; Chiller; Evaporative cooler; Fan (machine) ...
The SEER (Seasonal Energy Efficiency Ratio) rating of a unit is the cooling output during a typical cooling-season divided by the total electric energy input during the same period. The higher the unit's SEER rating the more energy efficient it is. smoke damper A damper or adjustable louver designed to augment the ventilation of a space during ...
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.