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The equipment and installation are considerably cheaper; 2 or more rooms can be installed in one day by one operative.
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They use less energy; they run at a lower system temperature; each room can be individually timed and have a stricter control of the rooms air temperature.
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They have no water whose volume requires heating, pumping and more heat exchangers which all require energy and it can freeze.
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They do not need any floor space in the building.
