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In the United States, federal licensure is generally handled by EPA certified (for installation and service of HVAC devices). Many U.S. states have licensing for boiler operation. Some of these are listed as follows: Arkansas [46] Georgia [47] Michigan [48] Minnesota [49] Montana [50] New Jersey [51] North Dakota [52] Ohio [53] Oklahoma [54 ...
One of the first modern hot water central heating systems to remedy this deficiency was installed by Angier March Perkins in London in the 1830s. At that time central heating was coming into fashion in Britain, with steam or hot air systems generally being used. Details of furnace and expansion tube from Perkins' 1838 Patent
Through the 1950s and 1960s, this style of furnace was used to replace the big, natural draft systems, and was sometimes installed on the existing gravity duct work. The heated air was moved by blowers which were belted driven and designed for a wide range of speeds.
DOE estimates that this efficiency improvement, and the resulting lower gas bills, would save consumers $1.9 billion annually — or $500 over the lifetime of each new furnace.
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Air conditioning, often abbreviated as A/C (US) or air con (UK), [1] is the process of removing heat from an enclosed space to achieve a more comfortable interior temperature and in some cases also controlling the humidity of internal air.
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