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  2. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    The refrigerator replaced the icebox, which had been a common household appliance for almost a century and a half. The United States Food and Drug Administration recommends that the refrigerator be kept at or below 4 °C (40 °F) and that the freezer be regulated at −18 °C (0 °F). [5] The first cooling systems for food involved ice. [6]

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  4. 6 Best Appliance Deals at Costco This July - AOL

    www.aol.com/finance/6-best-appliance-deals...

    This July, Costco members can shop a wide range of appliance deals and score incredible savings. Explore: Costco Prices Are Dropping Faster Than... 6 Best Appliance Deals at Costco This July

  5. GE Appliances - Wikipedia

    en.wikipedia.org/wiki/GE_Appliances

    GE Appliances was originally a part of General Electric, a company which began marketing a full roster of heating and cooking products in 1907. [11] In January 2004, it became part of GE Consumer & Industrial when GE Consumer Products (founded in 1905) merged with GE Industrial Systems (founded in 1930) to form GE Consumer & Industrial.

  6. Heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Heat_exchanger

    In counter-flow heat exchangers the fluids enter the exchanger from opposite ends. The counter current design is the most efficient, in that it can transfer the most heat from the heat (transfer) medium per unit mass due to the fact that the average temperature difference along any unit length is higher. See countercurrent exchange.

  7. Heating, ventilation, and air conditioning - Wikipedia

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

    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.

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