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Lennox has three different series of air conditioners, Elite, Dave Lennox Signature Collection and Merit series. [1] The Merit series is the lowest cost Lennox air conditioner, and there are 4 models of Single-stage with a 13, 14, 15 or 16 Seasonal energy efficiency ratio (SEER) rating. [2]
The company was founded in 1895, in Marshalltown, Iowa, by Dave Lennox, the owner of a machine repair business for railroads. [1] Inventors Ezra William Smith and Ernest Bryant brought their idea for a riveted steel coal-fired furnace to his machine shop to build parts for a prototype.
Also in the same year, Rheem and Ruud central air conditioners were reported to have the fewest percentage of units requiring repair among all major HVAC brands according to Consumer Reports. [ 21 ] Rheem's market share of the central air conditioner market had been as high as 16% in the 1980s and dropped to about 11% by 2000. [ 22 ]
The three major functions of heating, ventilation, and air conditioning are interrelated, especially with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. HVAC systems can be used in both domestic and commercial environments.
An air-conditioning unit rated at 72,000 BTU/h (21 kW) (6 tons), with a SEER rating of 10, operates 1000 hours per year at an electric energy cost of $0.12 per kilowatt-hour (kW·h). What is the annual cost of the electric energy it uses?
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