HVAC setback is an energy-saving strategy that reduces the amount of air supplied to an OR when not in use. An OR may be unused for 40 percent or more of the time, according to the monograph.
While ORs can adopt this strategy with little or no additional upfront cost for new facilities, in a retrofit upfront costs need to be taken into account. ASHE also suggested OR leaders will need to consider maintenance costs when planning HVAC setback.
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