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The company later signed an agreement to repair Philco window air conditioning units and Worthington's commercial air conditioning equipment. TD began to move into contracting. In 1949, General Electric offered TD its line of heating equipment, and the company began to have dealers and a small wholesale business.
Innovations in the latter half of the 20th century allowed more ubiquitous air conditioner use. In 1945, Robert Sherman of Lynn, Massachusetts, invented a portable, in-window air conditioner that cooled, heated, humidified, dehumidified, and filtered the air. [37] The first inverter air conditioners were released in 1980–1981. [38] [39]
All modern air conditioning systems, even small window package units, are equipped with internal air filters. [citation needed] These are generally of a lightweight gauze-like material, and must be replaced or washed as conditions warrant. For example, a building in a high dust environment, or a home with furry pets, will need to have the ...
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The leading product through the 1930s and '40s was electrical fans, many styles built into custom cabinets and permanent-type window fans. In the early '50s the company added a "central" or "attic fan" to its inventory. It pulled air from all open windows into the attic where it also ventilated the attic, making the house much cooler.