Air handlers are a system-like device used in ventilating systems. They typically consist of a blower, heat exchange medium for heat or air conditioning, and housing.
Evaporative coolers are cooling devices that use the evaporation of water into the air to cool the air temperature. They are sometimes called air coolers, desert coolers or swamp coolers.
Heating furnaces convert gas, oil, electricity or other fuels into heat for distribution within a structure. They are the central heating devices within HVAC systems.
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