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Household appliances
Any device found in the home designed for a specific function, especially electric devices such as toasters or refrigerators.
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Household appliances > Air conditioners 
Department of Energy
Household appliances; Air conditioners
A federal agency that sets industry efficiency standards and monitors the use of various energy sources.
direct expansion systems
Household appliances; Air conditioners
One of two types of basic cooling media (the other is chilled water). Direct expansion systems utilize freon for cooling and dehumidification. The three most common methods of ...
direct vent
Household appliances; Air conditioners
Pulls outside air for combustion and vents combustion gases directly outside.
downflow
Household appliances; Air conditioners
Refers to a type of precision air conditioning system that discharges air downward, directly beneath a raised floor, commonly found in computer rooms and modern office spaces.
downflow furnace
Household appliances; Air conditioners
A furnace that pulls in return air from the top and expels warm air at the bottom.
duct
Household appliances; Air conditioners
A pipe or closed conduit made of sheet metal, fiberglass board, or other suitable material used for conducting air to and from an air handling unit.
ductwork
Household appliances; Air conditioners
Pipes or channels that carry air throughout a building.
Sub-categories

- Air conditioners (10196)
- Coffee makers (602)
- Cooking appliances (87)
- Dishwashers (7)
- Home heating systems (7)
- Refrigerators & freezers (15)
- Vacuum cleaners (1899)
- Washing machines & dryers (1139)
- Water heaters (1090)