In buildings across the country, reductions in operating budgets are delaying important equipment upkeep. This article discusses impacts of deferring maintenance on rooftop package units and outlines a cost-based preventive-maintenance protocol. For new unitary air-conditioning and heat-pump systems, minimum energy-efficiency ratios (EERs) are 9.7 to 14 MBH per kilowatt, depending on system capacity. A substantial number of installed unitary systems, however, are operating at EERs of 9 or ...

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