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How Air Conditioning Works YouTube.
Air conditioner Simple English Wikipedia, the free encyclopedia.
Health implications change change source. Air conditioning has as much influence on human health as any generic heating system.Poorly maintained air-conditioning systems especially large, centralized systems can occasionally promote the growth and spread of microorganisms such as Legionella pneumophila, the infectious agent responsible for Legionnaire's' disease.
Air conditioning Wikipedia.
PTAC systems may be adapted to provide heating in cold weather, either directly by using an electric strip, gas, or other heaters, or by reversing the refrigerant flow to heat the interior and draw heat from the exterior air, converting the air conditioner into a heat pump.
Air Conditioning Department of Energy.
The two most common types of air conditioners are room air conditioners and central air conditioners. A compromise between the two types of systems is provided by ductless, mini-split air conditioners. See the following for specific information relating to these air conditioners.:

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