economizer
Noun
Meaning
One who, or that which, economizes.
Specifically: (Steam Boilers) An arrangement of pipes for heating feed water by waste heat in the gases passing to the chimney.
Source: Webster's dictionarySynonyms
economiser
reducer
saver
conservation
saving
economist
deliverer
cheapskate
retrench
sparer
pinchpenny
penny-pincher
conserver
salvager
economization
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Examples
In both cases, the outside air must be less energetic than the return air for the system to enter the economizer mode.
Some systems include an "economizer mode", which is sometimes called a "free-cooling mode".